英美文化背景与国家概况之美国地理.ppt

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1、WhiteHouse2011生物技术王传鑫2114122259contents(156-162)1、LandResource2、RiversandLakes3、ForestsandMineralResources4、NewProblemsUncleSamSatellitemapofAmerica卫星地图中的美国TopographicmapoftheUnitedStatesofAmerica美国地形图LandResourceAbout47%ofAmerica’slandareacanbeusedforagriculturalpurposes，including400millio

2、nacresofarable（适于耕种的）croplandand900millionacresofpermanentpastureland（牧场）。ThemainriversandmountainsofAmericaRiversandlakesMississippiRiver,itflowsabout6400kilometersfromitsnorthwesternsourceintheRockiestotheGulfofMexico,ItstributariesincludenearlyalltheriverswestoftheAppalachianmountains(阿帕

3、拉契山脉)andtheeastoftheRockies.BigsteamshiponMississippiMississippiBigdamonMississippiRockiesPotomacriver(波托马克河),itisfamousnotonlybecauseWashingtonD.C,itisregardedasthetraditionaldividinglinebetweentheSouthandtheNorth.ThesceneryofPotomacriverThesceneryofPotomacriverGrandCanyon(科罗拉多大峡谷)Greatlak

4、es,ofthesefivelakesonlyone,LakeMichigan,belongstoAmericacompletelywhiletheotherfouraresharedwithCanada.Thesefivelakes,withanareaofabout240000squarekilometers,constitutethelargestlakegroupintheworld.Greatlakes五大湖Greatlakes五大湖LakesuperiorLakeMichiganLakeHuronLakeErieLakeOntarioNiagaraFallsThe

5、fivelakesslopedownwardtowardstheeast.LakeErieisover100metershigherthanLakeOntarioandtheriverthatconnectsthemiscalledNiagara（尼亚加拉）River.ThesteepdropinelevationgivesbirthtotheNiagaraFalls,itattractslargenumbersofvisitorsfromaroundtheworld.NiagaraFallsNiagaraFallsThebiggestfallsintheworldNiaga

6、raFallsNiagaraFallsAmericahasbeenknownforitsrichforestresources.WhenthefirstEuropeancolonistsarrived,Americawasstillcoveredwithdenseforests,stretchingabout1600kilometersinland(国内的)fromtheAtlanticCoastline.Todayaboutone-thirdoftheUnitedStatesisstillcoveredwithforestsThedistributionofthefore

7、stsForestsandMineralResourcesThebiggesttreeintheworldSequoia(红杉)3000yearsoldDiameter：6metersTowers：100metersTheUnitedStatesisrichinmineralresources.Itranksamongthecountrieswiththegreatestreserves(储藏量)ofcoal,ironore,andoil.Italsoabounds(富于)inlead（铅）,coppe