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1、ErosionNewWords&PhrasesErosion:Thegroupofnaturalprocesses,includingweathering,dissolution,abrasion(磨损）,corrosion（腐蚀）,andtransportation,bywhichmaterialiswornaway（磨损）fromtheearth'ssurface.腐蚀，侵蚀：指使材料从地表磨损、消耗的一组自然过程，包括风化、溶解、磨蚀、浪蚀、腐蚀和搬运.fluvialerosion河流侵蚀geologicerosion地质侵蚀loesserosion
2、黄土侵蚀rainfallerosion降雨侵蚀rivererosion河流侵蚀sheeterosion片状侵蚀streambankerosion河岸侵蚀winderosion风蚀冲积层：河床、冲积平原或三角洲中的流水淤积所产生的沉积层.Alluvium[ə'l(j)uːviəm]:Sedimentdepositedbyflowingwater,asinariverbed,floodplain,ordelta.alluvial：冲积的，淤积的.Erode:Towear(something)awaybyorasifbyabrasion;Tocausetodim
3、inish（减小）,deteriorate（恶化）,ordisappearasifbyeatingintoorwearingaway.腐蚀；侵蚀：（象）被磨擦损耗掉;侵蚀掉，腐蚀掉：象磨蚀、侵蚀那样使…减少、减弱或消失.Silt:1）n.（名词）Asedimentarymaterialconsistingofveryfineparticlesintermediateinsizebetweensandandclay；泥沙，淤泥：由大小介于沙和泥之间的非常细小的微粒构成的沉淀性物质2）v.intr.（不及物动词）Tobecomefilledwithsilt;被
4、淤塞：使塞满泥沙3)v.tr.（及物动词）Tofill,cover,orobstructwithsilt.使淤积：用沙充满、覆盖或阻碍Siltation：冲积作用，淤积作用.耕地：已耕作的土地耕种：开垦土地Tillage:Landthathasbeentilled（耕种，耕耘）;Cultivation（耕种）ofland.黄土：一种风沉积而成的颗粒细小、含钙质的沙或泥土，呈浅黄色或黄褐色.Loess:Abufftograywindblown（被风吹的）depositoffine-grained,calcareous（钙化的）siltorclay.一、矿物质
5、土粒石砾：1mm砂粒：1-0.05mm粉粒：0.05-0.002mm粘粒：0.002mm土壤剖面结构蒸散TEXTErosionisanimportantnaturalprocess,rusultingintheredistributionoftheproductsofgeologicweathering,andispartofbothsoilformationandsoilloss.Theworld'slandscapeshavesculpted(雕刻）byerosion.Whentheresultsarespectacularenough,weens
6、hrine（铭记）theminnationalparksaswedidwiththeGrandCanyon（峡谷）.Whereerosionhasworndownmountainsandspreadsoilovertheplains,ordepositedrichalluvialsiltinriverbottomes,wegaldlyfarmit.Erosionisadisasteronlywhenitoccursinthewrongplaceatthewrongtime.Erosionisanimportantnaturalprocess,rusulti
7、ngintheredistributionoftheproductsofgeologicweathering,andispartofbothsoilformationandsoilloss.侵蚀是一个重要的自然过程，它导致了地质风化的产物的重新分配，是土壤形成和流失的部分原因。Theworld'slandscapeshavesculpted(雕刻）byerosion.世界的地形和地貌就是由于侵蚀的作用而形成的。Whentheresultsarespectacularenough,weenshrine（铭记）theminnationalparksaswedi
8、dwiththeGrandCanyon.有时候，侵蚀的效果如此壮观
