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Metamorphic(met•uh•MAWR•fik)rockscanbeformedfromigneous,sedimentary,orevenfromothermetamorphicrocks.Onetypeofmetamorphicrockiscalledgneiss(NIGHS).Thecolorfulbandsingneissareformedwhentheigneousrock,granite,isheatedundergreatpressure.一些用来的箍住的东西，不同于镶边mineralsgetrearrangedandpressedintothinlayers.Thelayersarecalledbands.Thecrystalsingneissarelargeandeasilyseen.Thisgivesgneissitscoarsetexture.Itfeelsrough.Thecrystalsinslatearepackedtogetherandarenoteasilyseen.Thesmallcrystalsgiveslateitsfinetexture.Itfeelssmooth.Shaleisasoftsedimentaryrock.Withheatandpressure,shalecanchangeintoslate.页岩Slatehasadifferentmineralmakeupthanshale.ThisguardianlioninBangkokismadeofmarble.lapislazuli(LAP•isLAZ•uh•lee)Quartziteisusedinglassmakingandceramics.陶瓷Tilefloors,stonewalls,andswimmingpoolsmayalsobemadefromquartzite.用来覆盖屋顶，墙壁，地板的小片，似乎是瓦片瓷砖片，贴片一类Manymetamorphicrocksaregroundupintosmallchunks.块；但achunk常常指一大部分Thechunksareoftenusedinthegravelyouseeindrivewaysandonthesideoftheroad.碎石Mostcoalisusedinitssofter,sedimentaryrockform,bituminouscoal.However,anthracite(AN•thruh•sight)coalisfounddeeperinEarth’slayers,soanthracitecoalisamuchhardercoalthanitssedimentaryform.Texture,crystalshapeandsize,andlayersarejustsomeofthecluesthatagoodrockdetectiveusestoidentifyarock.估计是晶体形状Rocksareconstantlychanging.Freezingandthawing,plants,wind,andpressurecancauserockstobreakintosmallerpieces.Thebreakingdownofrocksiscalledweathering(WETH•uhr•ing).Ifthewaterfreezes,itexpands.Thiscausescrackstowiden.Laterthewatermaythaw,ormelt.Overtime,repeatedfreezingandthawingbreaksrocksapart.Theserootswilleventuallysplittherockapart.exfoliationTheouterlayersoftheonce-buriedgraniteexpandmorethanthelayersbelow.Thiscausestheouterlayersofrocktopeelofflikethelayersofanonion.Thiskindofphysicalweatheringiscalledexfoliation(eks•foh•lee•AY•shuhn).abrasionWindsthatcarrybitsofsandcanbreakdownthesofterpartsofrocks.Thesharpedgesofsandwearawayrock.Thiswearingawayofrockbyblowingsandiscalledwindabrasion(uh•B
