英美概况教案配套课件UNIT 1(美国历史).ppt

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1、ASurveyofUSA:-----AmericanGeographyProf.NiangenHuang1.Location，SizeandGeographicalDivisionsTheUnitedStatesliesinthecentralpartofNorthAmericawithitstwoyoungeststates:AlaskaonthenorthwesttipofthecontinentandHawaiiinthecentralPacific．ThecontinentalUnitedStatesstretches4,500ki

2、lometersfromtheAtlanticOceanontheeasttothePacificOceanonthewest．1.Location,SizeandGeographicalDivisionsItbordersCanadaonthenorth，andreachessouthtoMexicoandtheGulfofMexico.Thetotalareaofthecountryisalittleover9,360,OOOsquarekilometers，whichmakesitthefourthlargestcountryinth

3、eworld．1.Location，SizeandGeographicalDivisionsThelargeterritoryofthecontinentalUnitedStatescanbedividedintothreebasicareas：theAtlanticSeacoastwesttotheAppalachianMountains；thegreatMississippiRivetBasinbetweentheAppalachianandtheRockyMountains;theRockieswesttothePacificOcea

4、n．1)TheAtlanticSeacoastWesttotheAppalachiansAlongtheAtlanticSeacoastisanarrowplainwhichbeginsfarupthecoastandbecomeswiderasitgoessouth．IntheNortheast，thelandextendingtotheAtlanticcoastlineishilly，rockyandmostlyinfertile．Muchofitiscoveredbyheavyforests．Thecoastlineisbrokenb

5、ymanyexcellentharborswhichwereonceimportantcentersofcommerceandtradeintheearlydaysofthecountry．1)TheAtlanticSeacoastWesttotheAppalachiansTheMiddleAtlanticSeacoastisaflatandfertileregion.Therearemilesandmilesbeautiful，opencountryallthroughthissection.Manyheavilywoodedmounta

6、insanddeepvalleycutbywideandbeautifulriverscanbefound．Threeimportantriversflowthroughthispartofthecountry:theHudson，theDelawareandtheSusquehanna．1)TheAtlanticSeacoastWesttotheAppalachiansInthedeepsouth，thecoastplainisverylowandwide.Thesoilofthisregionvariesgreatly．Somepart

7、salongthecoastarealmostpuresand．Othersectionscontainsomeoftherichestsoilinthewholecountry．However，theweather，thelandandtheriversthatrunthroughthesouthhavemadeit,formostofitshistory,agreatagriculturalregion.1)TheAtlanticSeacoastWesttotheAppalachiansThecoastalplainappearstob

8、efencedinbytheAppalachianMountainsthatbegininCanadaandreachallthewaytoGeorgiaandAlabama．T