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单词	clastic
释义	clastic /ˈklastɪk / adjective Geology Denoting rocks composed of broken pieces of older rocks: a group of clastic sediments such as conglomerates... Mechanical deposition, by water or wind, produces clastic rocks composed of broken fragments, generally of silicate minerals and small pieces of rock: sandstones and conglomerates. The Allouez Conglomerate is composed mainly of red-colored clastic rocks with lesser amounts of sandstone and siltstone. In contrast, the Cambrian clastic rocks are characterized by a paucity of these zircons, suggesting a significant difference between Neoproterozoic and Cambrian drainage systems. Origin Late 19th century: from French clastique, from Greek klastos 'broken in pieces'.
随便看	unconstitutionally unconstrained unconstrainedly unconstraint unconstricted unconstructed unconstructive unconsulted unconsumed unconsummated uncontactable uncontainable uncontaminated uncontentious uncontested uncontestedly uncontradicted uncontrived uncontrollable uncontrollableness uncontrollably uncontrolled uncontrolledly uncontroversial uncontroversially

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