李松青Word格式文档下载.docx
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李松青Word格式文档下载.docx
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Howtodistinguishthreekindsofrocks?
@#@@#@Therockisanaggregateofminerals.WeputrockdividerockintothreecategoriesincludingSedimentaryrocks,magmaticrocksandmetamorphicrocks.Accordingtothecause,structureandcompositionofmineral,whichformtherocks.Sedimentaryrockisalsocalledtherockformationwater,solidmixturehasexperiencedweathering,transportation,depositionandconsolidation.Undertheactionsofexternalforcebeforebecomingrock.Magmaticrockisalsonamedtheigneousrock.itisformedofCondensateofmagmathatinvadesoreruptsfromearth'@#@ssurface.MetamorphicrockisakindofrockthatcomefromthealterationofMagmaticrockandsedimentaryrock.Wecanfigureoutthethreekindsofrockfromthefollowingfoursteps:
@#@@#@1.mineralcomposition@#@Mineralsaremainlyprimarymineralofmagmaticrocks,andQuartz,feldspar,hornblende,blackmica,pyroxeneandolivineisverycommoninmagmaticrock.Inadditiontosomeoftheoriginalmineral(Quartz,feldspar,whitemica),SecondarymineralsaccountforanumberincludingCalcite,dolomite,kaolinite.Glauconiteandsoon.However,Metamorphicrockbesideshastheoriginalrockmineralcompositionandtypicalmetamorphicmineralssuchassericiteandgarnet.@#@2.structureandcomposition@#@Magmaticrocksarefeaturedwithgranularcrystal,porphyriticstructure.Inclasticsedimentaryrocks,argillaceousandbioclastic,chemicalstructureareasitscharacteristics.while,Metamorphicrockofmainstructureincludingcrystalloblastic,palimpsest,crushed.@#@3.constructionofrocks@#@Magmaticrockhasfluxion,porosity,almondandblockconstruction.And,SedimentaryrockhasbeddingstructuremainlyandContainsfossilspartially.Thenmetamorphicrockisfamousfortheconstructionofschistosity,MIT,block.@#@4.theoccurrence@#@MagmaticrockismainlyIntheformofintrusivebodyandeffusiverockoccupyleast.While,sedimentaryrocksaremainlypresentregularlayer.@#@李松青@#@211503010031@#@
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