rock

rock¹

R0273700 (rŏk)n.1. Relatively hard, naturally formed mineral or petrified matter; stone.2. a. A relatively small piece or fragment of such material.b. A relatively large body of such material, as a cliff or peak.3. A naturally formed aggregate of mineral matter constituting a significant part of the earth's crust.4. One that is similar to or suggestive of a mass of stone in stability, firmness, or dependability: The family has been his rock during this difficult time.5. rocks Slang Money.6. Slang A large gem, especially a diamond.7. Slang Crack cocaine.8. a. A varicolored stick candy.b. Rock candy.Idioms: between a rock and a hard place Confronted with equally unpleasant alternatives and few or no opportunities to evade or circumvent them. on the rocks1. In a state of difficulty, destruction, or ruin: Their marriage is on the rocks.2. Without money; bankrupt: Our accountant says the business is on the rocks.3. Served over ice cubes: Scotch on the rocks.

[Middle English, from Old North French roque, from Vulgar Latin *rocca, of unknown origin .]

rock²

R0273700 (rŏk)v. rocked, rock·ing, rocks v.intr.1. To move back and forth or from side to side, especially gently or rhythmically.2. To sway violently, as from a blow or shock. See Synonyms at swing.3. To be washed and panned in a cradle or in a rocker. Used of ores.4. Music To play or dance to rock music.5. Slang To be excellent or outstanding. Used in exclamations of approval.v.tr.1. To move (a child, for example) back and forth or from side to side, especially in order to soothe or lull to sleep.2. To cause to shake or sway violently. See Synonyms at agitate.3. a. To disturb the mental or emotional equilibrium of; upset: News of the scandal rocked the town.b. To excite or cause strong feeling in, as by playing rock music.4. To wash or pan (ore) in a cradle or rocker.5. In mezzotint engraving, to roughen (a metal plate) with a rocker or roulette.6. Slang To exhibit, display, or use with flair: The actor rocked a pair of diamond-studded sunglasses at the movie premiere.n.1. a. A rocking motion.b. The act of rocking.2. Music A form of popular music characterized by electronically amplified instrumentation, a heavily accented beat, and relatively simple phrase structure. Originating in the United States in the 1950s, rock incorporates a variety of musical styles, especially rhythm and blues, country music, and gospel. Also called rock-and-roll, rock 'n' roll.Idiom: rock the boat To disturb the balance or routine of a situation: He has an easygoing managerial style and won't rock the boat unless absolutely necessary.

[Middle English rokken, from Old English roccian.]

rock′ing·ly adv.

rock

(rɒk) n1. (Geological Science) geology any aggregate of minerals that makes up part of the earth's crust. It may be unconsolidated, such as a sand, clay, or mud, or consolidated, such as granite, limestone, or coal. See also igneous, sedimentary, metamorphic2. any hard mass of consolidated mineral matter, such as a boulder3. chiefly US and Canadian and Austral a stone4. a person or thing suggesting a rock, esp in being dependable, unchanging, or providing firm foundation5. (Cookery) Brit a hard sweet, typically a long brightly-coloured peppermint-flavoured stick, sold esp in holiday resorts6. (Jewellery) slang a jewel, esp a diamond7. (Animals) short for rock salmon8. (plural) slang the testicles9. (Recreational Drugs) slang another name for crack²⁹10. between a rock and a hard place having to choose between two equally unpleasant alternatives11. in a state of ruin or destitution12. (Cookery) (of drinks, esp whisky) served with ice[C14: from Old French roche, of unknown origin]

rock

(rɒk) vb1. to move or cause to move from side to side or backwards and forwards2. to reel or sway or cause (someone) to reel or sway, as with a violent shock or emotion3. (tr) to shake or move (something) violently4. (Dancing) (intr) to dance in the rock-and-roll style5. (Mining & Quarrying) mining to wash (ore) or (of ore) to be washed in a cradle6. (Art Terms) (tr) to roughen (a copper plate) with a rocker before engraving a mezzotint7. (tr) slang chiefly US to impress by wearing (an item of clothing) or playing (a musical instrument): she can still rock a miniskirt; he rocks a guitar like nobody’s business. 8. rock the boat informal to create a disturbance in the existing situationn9. a rocking motion10. (Pop Music) short for rock and roll11. (Pop Music) Also called: rock music any of various styles of pop music having a heavy beat, derived from rock and roll[Old English roccian; related to Middle Dutch, Old High German rocken, German rücken]

Rock

(rɒk) n1. (Placename) an informal name for Gibraltar2. (Placename) a Canadian informal name for Newfoundland

rock¹

(rɒk)

n. 1. a large mass of stone forming a hill, cliff, or the like. 2. a. mineral matter of variable composition, consolidated or unconsolidated, assembled in masses or considerable quantities in nature, as by the action of heat or water. b. a particular kind of such matter: igneous rock. 3. stone in the mass: built on rock. 4. a stone of any size. 5. something resembling a rock. 6. a firm foundation or support: The Lord is my rock. 7. rock candy. 8. Slang. a. a diamond. b. any gem. 9. Slang. a. crack (def. 30). b. a pellet or lump of crack. Idioms: 1. between a rock and a hard place, between undesirable alternatives. 2. on the rocks, a. Informal. ruined or destroyed: a marriage on the rocks. b. (of an alcoholic beverage) served straight with ice. [1300–50; Middle English rokk(e) < Old French ro(c)que, roche; Medieval Latin rocha, rocca (> late Old English -rocc in stānrocc “stone-rock”)] rock′like`, adj.

rock²

(rɒk)

v.i. 1. to move or sway to and fro or from side to side. 2. to be moved or swayed powerfully with excitement, emotion, etc. 3. (of ore) to be washed in a cradle. 4. to dance to or play rock music. v.t. 5. to move or sway to and fro or from side to side, esp. gently and soothingly. 6. to lull in security, hope, etc. 7. to affect deeply; stun. 8. to shake or disturb violently: An explosion rocked the dock. n. 9. a rocking movement. 10. a musical style derived in part from blues and folk music and marked by an accented beat and repetitive phrase structure. adj. 11. pertaining to or characteristic of musical rock. [before 1100; Middle English; Old English roccian, c. Middle Dutch rocken; akin to German rücken to move, push, Old Norse rykkja to jerk; (definition 14) short for rock and roll (1951), a phrase used earlier in the lyrics or title of several rhythm and blues songs] rock′a•ble, adj. rock′ing•ly, adv.

rock

(rŏk)1. A relatively hard, naturally occurring mineral material. Rock can consist of a single mineral or of several minerals that are either tightly compacted or held together by a cement-like mineral matrix. The three main types of rock are igneous, sedimentary, and metamorphic.2. A fairly small piece of such material; a stone.

rock

Past participle: rocked
Gerund: rocking

Imperative
rock
rock

Present
I rock
you rock
he/she/it rocks
we rock
you rock
they rock

Preterite
I rocked
you rocked
he/she/it rocked
we rocked
you rocked
they rocked

Present Continuous
I am rocking
you are rocking
he/she/it is rocking
we are rocking
you are rocking
they are rocking

Present Perfect
I have rocked
you have rocked
he/she/it has rocked
we have rocked
you have rocked
they have rocked

Past Continuous
I was rocking
you were rocking
he/she/it was rocking
we were rocking
you were rocking
they were rocking

Past Perfect
I had rocked
you had rocked
he/she/it had rocked
we had rocked
you had rocked
they had rocked

Future
I will rock
you will rock
he/she/it will rock
we will rock
you will rock
they will rock

Future Perfect
I will have rocked
you will have rocked
he/she/it will have rocked
we will have rocked
you will have rocked
they will have rocked

Future Continuous
I will be rocking
you will be rocking
he/she/it will be rocking
we will be rocking
you will be rocking
they will be rocking

Present Perfect Continuous
I have been rocking
you have been rocking
he/she/it has been rocking
we have been rocking
you have been rocking
they have been rocking

Future Perfect Continuous
I will have been rocking
you will have been rocking
he/she/it will have been rocking
we will have been rocking
you will have been rocking
they will have been rocking

Past Perfect Continuous
I had been rocking
you had been rocking
he/she/it had been rocking
we had been rocking
you had been rocking
they had been rocking

Conditional
I would rock
you would rock
he/she/it would rock
we would rock
you would rock
they would rock

Past Conditional
I would have rocked
you would have rocked
he/she/it would have rocked
we would have rocked
you would have rocked
they would have rocked

rock

Any solid mass that is composed of minerals, forming a part of the Earth’s crust.

Thesaurus

Noun	1.	rock - a lump or mass of hard consolidated mineral matter; "he threw a rock at me"stonenatural object - an object occurring naturally; not made by manachondrite - a stony meteor lacking chondrulesbedrock - solid unweathered rock lying beneath surface deposits of soilboulder, bowlder - a large smooth mass of rock detached from its place of origincalculus, concretion - a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body; "renal calculi can be very painful"chondrite - a rock of meteoric origin containing chondrulesclastic rock - (geology) a rock composed of broken pieces of older rockscrystallization, crystal - a rock formed by the solidification of a substance; has regularly repeating internal structure; external plane facesintrusion - rock produced by an intrusive processoutcrop, outcropping, rock outcrop - the part of a rock formation that appears above the surface of the surrounding landpebble - a small smooth rounded rockpetrifaction - a rock created by petrifaction; an organic object infiltrated with mineral matter and preserved in its original formsill - (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rockstepping stone - a stone in a marsh or shallow water that can be stepped on in crossingtor - a prominent rock or pile of rocks on a hillwall rock - a rock immediately adjacent to a vein or faultwhinstone, whin - any of various hard colored rocks (especially rocks consisting of chert or basalt)xenolith - (geology) a piece of rock of different origin from the igneous rock in which it is embedded
	2.	rock - material consisting of the aggregate of minerals like those making up the Earth's crust; "that mountain is solid rock"; "stone is abundant in New England and there are many quarries"stonematerial, stuff - the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread"mineral - solid homogeneous inorganic substances occurring in nature having a definite chemical compositionquartzite - hard metamorphic rock consisting essentially of interlocking quartz crystalsroad metal - broken rock used for repairing or making roadssedimentary rock - rock formed from consolidated clay sedimentssial - the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminumsima - rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesiummetamorphic rock - rock altered by pressure and heatcrushed rock, gravel - rock fragments and pebblescaliche - nitrate-bearing rock or gravel of the sodium nitrate deposits of Chile and Perushingling - (geology) sediment in which flat pebbles are uniformly tilted in the same directionpumice, pumice stone - a light glass formed on the surface of some lavas; used as an abrasiveaphanite - fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eyeclaystone - fine-grained rock consisting of compacted clay particlesdolomite - a kind of sedimentary rock resembling marble or limestone but rich in magnesium carbonateemery rock, emery stone - a mixture of emery dust and a binder; can be molded into grindstonesconglomerate, pudding stone - a composite rock made up of particles of varying sizefieldstone - stone that occurs naturally in fields; often used as building materialgreisen - a granitic rock composed of quartz and micacalc-tufa, tufa - a soft porous rock consisting of calcium carbonate deposited from springs rich in limemagma - molten rock in the earth's crustigneous rock - rock formed by the solidification of molten magmalimestone - a sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animalsmarble - a hard crystalline metamorphic rock that takes a high polish; used for sculpture and as building materialmatrix - (geology) amass of fine-grained rock in which fossils, crystals, or gems are embedded
	3.	Rock - United States gynecologist and devout Catholic who conducted the first clinical trials of the oral contraceptive pill (1890-1984)John Rock
	4.	rock - (figurative) someone who is strong and stable and dependable; "he was her rock during the crisis"; "Thou art Peter, and upon this rock I will build my church"--Gospel According to Matthewgood person - a person who is good to other people
	5.	rock - hard bright-colored stick candy (typically flavored with peppermint)rock candycandy, confect - a rich sweet made of flavored sugar and often combined with fruit or nuts
	6.	rock - a genre of popular music originating in the 1950s; a blend of black rhythm-and-blues with white country-and-western; "rock is a generic term for the range of styles that evolved out of rock'n'roll."rock and roll, rock music, rock 'n' roll, rock-and-roll, rock'n'rollpopular music, popular music genre - any genre of music having wide appeal (but usually only for a short time)heavy metal music, heavy metal - loud and harsh sounding rock music with a strong beat; lyrics usually involve violent or fantastic imageryart rock, progressive rock - a style of rock music that emerged in the 1970s; associated with attempts to combine rock with jazz and other forms; intended for listening and not dancingacid rock, psychedelic rock - a musical style that emerged in the 1960s; rock music inspired by or related to drug-induced experiencepunk rock, punk - rock music with deliberately offensive lyrics expressing anger and social alienation; in part a reaction against progressive rockbackbeat - a loud steady beat
	7.	rock - pitching dangerously to one side careen, sway, tiltpitching, lurch, pitch - abrupt up-and-down motion (as caused by a ship or other conveyance); "the pitching and tossing was quite exciting"
Verb	1.	rock - move back and forth or sideways; "the ship was rocking"; "the tall building swayed"; "She rocked back and forth on her feet"sway, shakeroll - move, rock, or sway from side to side; "The ship rolled on the heavy seas"rock, sway - cause to move back and forth; "rock the cradle"; "rock the baby"; "the wind swayed the trees gently"nutate - rock, sway, or nod; usually involuntarilyswag - sway heavily or unsteadilymove back and forth - move in one direction and then into the opposite directiontotter - move without being stable, as if threatening to fall; "The drunk man tottered over to our table"
	2.	rock - cause to move back and forth; "rock the cradle"; "rock the baby"; "the wind swayed the trees gently"swaymove, displace - cause to move or shift into a new position or place, both in a concrete and in an abstract sense; "Move those boxes into the corner, please"; "I'm moving my money to another bank"; "The director moved more responsibilities onto his new assistant"rock, sway, shake - move back and forth or sideways; "the ship was rocking"; "the tall building swayed"; "She rocked back and forth on her feet"

rock

¹noun1. stone, boulder She sat cross-legged on the rock.2. cliff, tor, outcrop, crag The tower is built on a rock.3. tower of strength, foundation, cornerstone, mainstay, support, protection, anchor, bulwark She was the rock of the family.on the rocks in trouble, breaking down, falling apart, in tatters Why's your marriage on the rocks?

Types of rock

andesite, anorthosite, anthracite, arkose, basalt, breccia, chalk, chert, clay, coal, conglomerate, diorite, dolerite, dolomite, dunite, eclogite, felsite or felstone, flint, gabbro, gneiss, granite, granodiorite, gravel, greywacke or (U.S.) graywacke, grit, hornblendite, hornfels, lamprophyre, lava, lignite, limestone, loess, marble, monzonite, mudstone, obsidian, pegmatite, peridotite, perknite, phyllite, pitchstone, pumice, pyroxenite, quartzite, rhyolite, sandstone, schist, shale, skarn, slate, soapstone, syenite, trachyte

rock

²verb1. sway, pitch, swing, reel, toss, lurch, wobble, roll His body rocked from side to side.2. shock, surprise, shake, stun, astonish, stagger, jar, astound, daze, dumbfound, set you back on your heels (informal) His death rocked the fashion business.

rock

verb1. To move vigorously from side to side or up and down:heave, pitch, roll, toss.2. To move to and fro violently:quake, shake, tremble, vibrate.3. To cause to move to and fro violently:agitate, churn, convulse, shake.4. To impair or destroy the composure of:agitate, bother, discompose, disquiet, distract, disturb, flurry, fluster, perturb, ruffle, shake (up), toss, unsettle, upset.Informal: rattle.

Translations

石块岩石怀抱婴儿回摆动摇摆摇摆乐

rock¹

(rok) noun1. (a large lump or mass of) the solid parts of the surface of the Earth. The ship struck a rock and sank; the rocks on the seashore; He built his house on solid rock.岩石2. a large stone. The climber was killed by a falling rock.石块3. a type of hard sweet made in sticks. a stick of Edinburgh rock.一块硬糖ˈrockery – plural ˈrockeries – noun a heap of rocks in a garden with earth between them in which small plants are grown. 假山ˈrocky adjectivea rocky coastline. 多岩石的，由岩石组成的 ˈrockiness noun 冷酷，坚硬性，坚固 ˌrock-ˈbottom noun, adjective (at) the lowest level possible. Prices have reached rock-bottom; rock-bottom prices.最低点ˈrock-garden noun a rockery. 有假山的花圈ˈrock-plant noun any plant which grows among rocks eg on mountains, often also grown in rockeries. 岩生植物on the rocks in a state of ruin or of great financial difficulty. Their marriage is on the rocks; The firm is on the rocks. 毁坏，濒于破产

rock²

(rok) verb1. to (cause to) swing gently backwards and forwards or from side to side. The mother rocked the cradle; This cradle rocks.使摆动2. to swing (a baby) gently in one's arms to comfort it or make it sleep. 怀抱（婴儿）来回摆动抚慰 3. to shake or move violently. The earthquake rocked the building.使...摇晃ˈrocker noun1. one of usually two curved supports on which a cradle, rocking-chair etc rocks. 可摇动的东西，摇轴 2. a rocking-chair. 摇椅ˈrocky adjective which rocks or shakes; unsteady; unsafe. 摇动的，不稳的 ˈrockiness noun摇动ˈrocking-chair noun a chair which rocks backwards and forwards on rockers. 摇椅ˈrocking-horse noun a toy horse which rocks backwards and forwards on rockers. 摇木马off one's rocker mad; crazy. 发疯

rock³

(rok) noun (also rock music) music or songs with a strong, heavy beat and usually a simple melody. She likes rock; (also adjective) a rock band.摇摆乐ˌrock'n'ˈroll noun (also ˌrock-and-ˈroll) a simpler, earlier form of rock music. 摇滚乐（以旋律单纯及节奏强烈为特征的一种流行音乐）摇摆舞

rock

→ 岩石zhCN, 摇摆zhCN, 石块zhCN

rock

rock,

aggregation of solid matter composed of one or more of the mineralsmineral,
inorganic substance occurring in nature, having a characteristic and homogeneous chemical composition, definite physical properties, and, usually, a definite crystalline form. A few of the minerals (e.g.
..... Click the link for more information. forming the earth's crust. The scientific study of rocks is called petrology. Rocks are commonly divided, according to their origin, into three major classes—igneous, sedimentary, and metamorphic.

Igneous Rocks

Igneous rock originates from the cooling and solidification of molten matter from the earth's interior. If the rock is formed on the earth's surface (i.e., from the solidification of lava), it is called extrusive rock; igneous rock that has cooled and solidified slowly beneath the earth's surface is intrusive rock. Among the forms commonly taken by intrusive rocks are batholithsbatholith,
enormous mass of intrusive igneous rock, that is, rock made of once-molten material that has solidified below the earth's surface (see rock). Batholiths usually are granitic (see granite) in composition, have steeply inclined walls, have no visible floors, and
..... Click the link for more information. , which are enormous, irregular masses cutting or displacing older rocks; stocks, irregular and smaller than batholiths; necks, or plugs, columnar in form and probably the result of the hardening of magma in the necks of extinct volcanoes; dikes, more or less vertical, filling fissures in previously existing rock; sills, more or less horizontal, forced between layers of previously existing rock; and laccoliths, modified domelike sills that arch under the overlying rock.

Igneous rocks are commonly divided into classes by texture. Some rocks are markedly granular (e.g., granitegranite,
coarse-grained igneous rock of even texture and light color, composed chiefly of quartz and feldspars. It usually contains small quantities of mica or hornblende, and minor accessory minerals may be present.
..... Click the link for more information. , syenite, diorite, gabbro, peridotite, and pyroxenite), while others (e.g., basaltbasalt
, fine-grained rock of volcanic origin, dark gray, dark green, brown, reddish, or black in color. Basalt is an igneous rock, i.e., one that has congealed from a molten state.
..... Click the link for more information. , trachite, dacite, and andesite) are composed of grains visible only under a microscope. Both fine-grained and coarse-grained igneous rocks frequently contain grains called phenocrysts that are larger than the surrounding grains; such rocks are said to be porphyritic in texture (see porphyryporphyry
, igneous rock composed of large, conspicuous crystals (phenocrysts) and a groundmass in which the phenocrysts are embedded. Some authorities consider the expression "porphyritic rock" better usage than porphyry, since the term refers only to the texture of the
..... Click the link for more information. ). Rocks with grains of uniform size are called equigranular.

Igneous rocks are commonly light in color if their constituent minerals are predominantly alkali feldspars and dark in color if the feldspars are calcic or if magnesia and iron minerals are abundant. The glassy igneous rocks include obsidian, pitchstone, and pumicepumice
, volcanic glass formed by the solidification of lava that is permeated with gas bubbles. Usually found at the surface of a lava flow, it is colorless or light gray and has the general appearance of a rock froth.
..... Click the link for more information. , which contain few or no phenocrysts, and vitrophyre, or glass porphyry, which does contain phenocrysts. Rocks such as tuff and volcanic breccia, which are formed from fragmental volcanic material, are sometimes grouped as pyroclastic rocks.

Sedimentary Rocks

Sedimentary rocks originate from the consolidation of sedimentssediment,
mineral or organic particles that are deposited by the action of wind, water, or glacial ice. These sediments can eventually form sedimentary rocks (see rock).
..... Click the link for more information. derived in part from living organisms but chiefly from older rocks of all classes (ultimately the mineral elements are derived from igneous rocks alone). The sediments of inorganic origin are chiefly removed from older rocks by erosion and transported to the place of deposition; chemical precipitation from solution is a secondary cause of deposition of inorganic matter. Sedimentary rocks are commonly distinguished, according to their place of deposition, by a great variety of terms, such as continental, marine (i.e., oceanic), littoral (i.e., coastal), estuarine (i.e., in an estuary), lacustrine (i.e., lakes), and fluviatile, or fluvial (i.e., in a stream).

The characteristic feature of sedimentary rocks is their stratificationstratification
(Lat.,=made in layers), layered structure formed by the deposition of sedimentary rocks. Changes between strata are interpreted as the result of fluctuations in the intensity and persistence of the depositional agent, e.g.
..... Click the link for more information. ; they are frequently called stratified rocks. Sedimentary rocks made up of angular particles derived from other rocks are said to have a clastic texture, in contrast to pyroclastic sediments, which are particles of volcanic origin. Among the important varieties of sedimentary rock, distinguished both by texture and by chemical composition, are conglomerate, sandstonesandstone,
sedimentary rock formed by the cementing together of grains of sand. The usual cementing material in sandstone is calcium carbonate, iron oxides, or silica, and the hardness of sandstone varies according to the character of the cementing material; quartz sandstones
..... Click the link for more information. , tillite, sedimentary breccia, shaleshale,
sedimentary rock formed by the consolidation of mud or clay, having the property of splitting into thin layers parallel to its bedding planes. Shale tends to be fissile, i.e., it tends to split along planar surfaces between the layers of stratified rock.
..... Click the link for more information. , marlmarl
or bog lime,
soil, essentially clay mixed with carbonate of lime, highly valued as a dressing or fertilizer. It crumbles rapidly and easily. Marl in which the lime is in the form of invertebrate shells is called shell marl.
..... Click the link for more information. , chalkchalk,
mineral of calcium carbonate, similar in composition to limestone, but softer. It is characteristically a marine formation and sometimes occurs in great thickness; the chief constituents of these chalk deposits are the shells of minute animals called foraminiferans.
..... Click the link for more information. , limestonelimestone,
sedimentary rock wholly or in large part composed of calcium carbonate. It is ordinarily white but may be colored by impurities, iron oxide making it brown, yellow, or red and carbon making it blue, black, or gray. The texture varies from coarse to fine.
..... Click the link for more information. , coalcoal,
fuel substance of plant origin, largely or almost entirely composed of carbon with varying amounts of mineral matter. Types

There is a complete series of carbonaceous fuels, which differ from each other in the relative amounts of moisture, volatile matter,
..... Click the link for more information. , lignitelignite
or brown coal,
carbonaceous fuel intermediate between coal and peat, brown or yellowish in color and woody in texture. It contains more moisture than coal and tends to dry and crumble when exposed to the air; the flame is long and smoky and the heating power
..... Click the link for more information. , gypsumgypsum
, mineral composed of calcium sulfate (calcium, sulfur, and oxygen) with two molecules of water, CaSO₄·2H₂O. It is the most common sulfate mineral, occurring in many places in a variety of forms. A transparent crystalline variety is selenite.
..... Click the link for more information. , and rock salt. Characteristic occurrences in sedimentary rocks are fossils, footprints, raindrop impressions, concretions, oolites, ripple marks, rill marks, and crossbedding. Some of these features are useful in determining the antiquity of sedimentary formations and in interpreting geologic history.

Metamorphic Rocks

Metamorphic rocks originate from the alteration of the texture and mineral constituents of igneous, sedimentary, and older metamorphic rocks under extreme heat and pressure deep within the earth (see metamorphismmetamorphism,
in geology, process of change in the structure, texture, or composition of rocks caused by agents of heat, deforming pressure, shearing stress, hot, chemically active fluids, or a combination of these, acting while the rock being changed remains essentially in the
..... Click the link for more information. ). Some (e.g., marblemarble,
metamorphic rock composed wholly or in large part of calcite or dolomite crystals, the crystalline texture being the result of metamorphism of limestone by heat and pressure.
..... Click the link for more information. and quartzitequartzite,
usually metamorphic rock composed of firmly cemented quartz grains. Most often it is white, light gray, yellowish, or light brown, but is sometimes colored blue, green, purple, or black by included minerals. It results from the metamorphism of pure quartz sandstone.
..... Click the link for more information. ) are massive in structure; others, and particularly those which have been subject to the more extreme forms of metamorphism, are characterized by foliation (i.e., the arrangement of their minerals in roughly parallel planes, giving them a banded appearance). A distinguishing characteristic of many metamorphic rocks is their slaty cleavagecleavage,
tendency of many minerals to split along definite smooth planar surfaces determined by their crystal structure. The directions of these surfaces are related to weaknesses in the atomic structure of the mineral and are always parallel to a possible crystal face.
..... Click the link for more information. . Among the common metamorphic rocks are schistschist
, metamorphic rock having a foliated, or plated, structure called schistosity in which the component flaky minerals are visible to the naked eye. Schists are distinguished from the other foliated rocks, slates and gneisses, by the size of their mineral crystals; these are
..... Click the link for more information. (e.g., mica schist and hornblende schist), gneissgneiss
, coarse-grained, imperfectly foliated, or layered, metamorphic rock. Gneiss is characterized by alternating light and dark bands differing in mineral composition and having coarser grains than those of schist.
..... Click the link for more information. , quartzite, slateslate,
fine-grained rock formed when sedimentary rocks such as shale are metamorphosed by great pressure. Slate splits into perfectly cleaved, broad thin layers; this characteristically regular and planar cleavage is called slaty cleavage.
..... Click the link for more information. , and marble.

Bibliography

See H. Blatt et al., Origin of Sedimentary Rocks (1972); A. F. Deeson, ed., The Collector's Encyclopedia of Rocks and Minerals (1973); N. Cristescu, Rock Rheology (1988).

What does it mean when you dream about a rock?

Rocks usually embody stability and permanence, as signified by the expression “solid as a rock.” A large rock or boulder in a dream may indicate the dreamer is making a commitment to a relationship or contemplating some change that will provide a more solid foundation.

rock

[räk] (petrology) A consolidated or unconsolidated aggregate of mineral grains consisting of one or more mineral species and having some degree of chemical and mineralogic constancy. In the popular sense, a hard, compact material with some coherence, derived from the earth.

rock

1. Solid natural mineral material, occurring in fragments or large masses and requiring mechanical or explosive techniques for removal. 2. Stone in a mass. 3. A stone of any size.

rock

1. Geology any aggregate of minerals that makes up part of the earth's crust. It may be unconsolidated, such as a sand, clay, or mud, or consolidated, such as granite, limestone, or coal 2. short for rock salmon3. Slang another name for crack4. on the rocksa. in a state of ruin or destitution b. (of drinks, esp whisky) served with ice

Rock

1. the. an informal name for Gibraltar 2. the. a Canadian informal name for Newfoundland

Rocks

(dreams)The connotation of this symbol as with all other dream symbols, depends on the details and the mood of the dream. The rock or rocks in your dream could represent a variety of different ideas, but it usually has something to do with matters of this physical world. Rocks generally do not represent emotional, psychological, or spiritual issues. Rather, they may represent earthiness, sturdiness, stability, and a solid foundation. On the other hand, they could represent physical obstacles or difficulties which the dreamer may need to overcome.

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Types of rock

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Igneous Rocks

Sedimentary Rocks

Metamorphic Rocks

Bibliography

What does it mean when you dream about a rock?

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Patient discussion about Rock

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Synonyms for rock

noun stone

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noun cliff

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noun tower of strength

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phrase on the rocks

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verb sway

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verb shock

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Synonyms for rock

verb to move vigorously from side to side or up and down

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verb to move to and fro violently

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verb to cause to move to and fro violently

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verb to impair or destroy the composure of

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Synonyms for rock

noun a lump or mass of hard consolidated mineral matter

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noun material consisting of the aggregate of minerals like those making up the Earth's crust

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noun United States gynecologist and devout Catholic who conducted the first clinical trials of the oral contraceptive pill (1890-1984)

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noun (figurative) someone who is strong and stable and dependable

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noun hard bright-colored stick candy (typically flavored with peppermint)

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noun a genre of popular music originating in the 1950s

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