单词	permafrost
释义	permafrostper‧ma‧frost /ˈpɜːməfrɒst $ ˈpɜːrməfrɒːst/ noun [uncountable] Word Origin WORD ORIGINpermafrost Origin: 1900-2000 permanent + frost Examples EXAMPLES FROM THE CORPUS Florence in permafrost Cold pinches the hills around Florence. Fulton lay on the permafrost, miming a cerebral haemorrhage. Lenses of rather pure ice are conceivable, but more likely is a permafrost containing 10 percent to 30 percent ice. Most of Mars seems to be covered with a layer of permafrost, kilometers deep in places. The first option is to extract water from subsurface permafrost and use that water directly in a nuclear or solar steam rocket. Undulating coastal plains and other ungraded lowlands, underlain by permafrost, in summer form some of the tundra's wettest areas. Very important to know, because suppose you got permafrost under your concrete slab? Water extraction from permafrost by distillation seems rather straight forward. word sets WORD SETS► Geology agglomerate, nounalabaster, nounanthracite, nounasbestos, nounatoll, nounbasalt, nounbasin, nounbauxite, nounbed, nounbedrock, nounberyl, nounbluff, nouncanyon, nouncape, nouncarboniferous, adjectivechalk, nounchalky, adjectivechasm, nounclay, nouncliff, nouncoal, nouncoastal, adjectivecoastline, nounconglomerate, nouncontinental drift, nouncontinental shelf, nouncore, nouncove, nouncrag, nouncrater, nouncreek, nounCretaceous, adjectivecrevasse, nouncrust, nouncrystal, nouncrystalline, adjectivecrystallize, verbdelta, noundeposit, noundeposition, noundune, noundust bowl, nounearthquake, nounelevation, nounemery, nounepicentre, nounepoch, nounera, nounerode, verberosion, nounerupt, verbescarpment, nounestuary, nounextinct, adjectivefault, nounfeeder, nounfeldspar, nounfiord, nounfjord, nounflint, nounflood plain, nounfluvial, adjectivefold, nounfool's gold, nounfossil, nounfossilize, verbfriable, adjectivegeology, noungeyser, nounglaciation, nounglacier, nounGondwanaland, granite, noungrassland, noungroundwater, noungulf, noungully, nounheadland, nounhinterland, nounhot spring, nounigneous, adjectiveimpervious, adjectiveinactive, adjectiveinlet, nounisthmus, nounjasper, nounjet, nounkaolin, nounknoll, nounlagoon, nounlake, nounlandlocked, adjectivelandslide, nounlandslip, nounlava, nounleach, verblevee, nounlime, nounlimestone, nounloam, nounlowlands, nounmagma, nounmarble, nounmarsh, nounmarshland, nounmatrix, nounmetamorphic, adjectivemica, nounmineral, nounmineralogy, nounmining, nounmoraine, nounmorass, nounmountain, nounmountainside, nounmountaintop, nounmudslide, nounnugget, nounoasis, nounoilfield, nounore, nounoutcrop, nounpalaeontology, nounPalaeozoic, adjectivePangaea, peninsula, nounpermafrost, nounpetroleum, nounpillar, nounpinnacle, nounplate, nounplate tectonics, nounporous, adjectivepothole, nounprairie, nounprecipice, nounpromontory, nounpumice, nounpyrites, nounquartz, nounravine, nounreservoir, nounridge, nounrift, nounrift valley, nounriver, nounrock, nounrock salt, nounsand, nounsand bar, nounsandstone, nounsapphire, nounscarp, nounschist, nounscree, nounseam, nounsediment, nounsedimentary, adjectivesedimentation, nounseismic, adjectiveseismograph, nounseismology, nounsettlement, nounshale, nounshelf, nounshingle, nounsilica, nounsilicate, nounsilt, nounslate, nounstalactite, nounstalagmite, nounstone, nounstrait, nounstrata, stratified, adjectivestratum, nounsubsoil, nounsubstratum, nounsummit, nounterrain, nounthermal, adjectivetopaz, nountopsoil, nountor, nountremor, nountributary, nountrilobite, nountsunami, nountundra, nounturquoise, nounvalley, nounvein, nounvolcanic, adjectivevolcano, nounwatercourse, nounwaterfall, nounwater table, noun a layer of soil that is always frozen in countries where it is very cold
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