2021年12月英语四级听力:Soils
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2021年12月英语四级听力:Soils思维导图模板大纲
Soils
Therearemanydifferentkindsofsoils.Differentsoilshavedifferenttypesofrockandmineralsinthem.Somesoilshavemorewaterinthemthanothers.Somesoilsmighthavemoreplantandanimalmaterialinthem,too.
Differentkindsofsoilsarefoundindifferentpartsoftheworld.ThereareseveralkindsofsoilsfoundintheUnitedStates.Insomeareas,thesoilhasalotofclay.Othersoilsareverysandy.Loamisakindofsoilthathasagoodmixtureofclayandsand.
Insomeplaces,soillayersareverythick.Lotsofplantsgrowinplaceswithathicksoillayer.Indryandwindyplacessoillayersaremuchthinner.Layersofsoilonmountainsarethinbecausegravitypullsthesoildownhill.
Thetypeofsoilinaparticularplaceaffectswhatkindsofplantscangrowthere.
UsefulWords:
1.clay黏土,泥土
2.loam肥土
3.layer层
4.gravity地心引力,重力
5.downhill往下