搜索
TheNaturalgeographyOfAmericacontent1.TheUnitedStatesterritoryrange2.Positionandarea3.SurfaceRegionsandlandforms4.climate&weather5.Rivers&lakes6.Naturalresources7.Naturaldisasters8.TheUnitedStatesotherconditionsTheUnitedStatesterritoryrangeTheUnitedStatesonJuly4,1776,independent,relyonnorthAmericanadvantageousnaturalconditionsandcontinuousoutwardexpansionofitsterritory.Andafteracenturyoftimecapitalisteconomyofrapiddevelopment,nowhasamonopolycapitalismhighlydevelopedcountriesintheworldtoday,isalsoabundanteconomicstrengthandproductivitylevelhighlydevelopedcapitalistcountries.TheU.S.territoryofexpansionPositionandareaTheUnitedStatesofAmerica,theabbreviationoftheUnitedStates.U.S.A.TheUnitedStatesthecountryisdividedintofiftystatesandaspecialeconomiczone,saysColumbia,namelyofDistrictthentoWashington,D.C.islocated.Amongthemthereare48statesindomestic,andtwootheroverseasstate,whichislocatedinthenorthAmericancontinentnorthwestAlaskaandislocatedinAlaskainthenorthernPacificOceanofHawaii.ThemainpartofthehomelandinthecentralNorthAmerica,theeastcoastinthewestPacific,Atlanticocean,with49northlatitude.Inaddition,therearesomeAmericanterritoryandtrust.Thelandcoversanareaof937.1squarekilometers,aftertheformerSovietunion,CanadaandChina,rankedfourthplace.SurfaceRegionsandlandformsU.S.landcanbedividedintosevenmainareas:(1)Appalachia；(2)thecoastallowland,；(3)CentralPlainsRegion；(4)OzarkMountains；(5)RockyMountains；(6)westerngrasslands,basin；(7)Pacificcoastlowlands.太平洋大西洋Northandsouthtandemthreelandform西部高山区中部大平原东部高原山地120oW60oWclimate&weatherNativeandChina'slatitudebasicsame,belongtothenorthtemperatezone,reasonclimateandChinaalsohavesimilarities,inadditiontocoastalareasoutside,majorityisinhotsummerandcoldwinterofcontinentalclimate.TheUnitedStatesnationalthewettestplaceisHawaiikauaiwei,averageannualrainfall.Drewupmount11,700millimeter.Thedry,thehottestplaceisCalifornia'sdeathvalleyandtheaverageannualrainfallisevenlessthan50millimeters,highesttemperaturewasashighas57℃TheU.S.minimumtemperaturerecordsis-62℃,thisisinJanuary1971inAlaskaprologispiebayshyoftherecord.Rivers&lakesTheMississippiRiveristhemainrivers,isalsothelargestriverinNorthAmerica,theMissouririveristhesource,thespan6,262kilometers,isoneofthelongestriversintheworldfromCentralAmerica,thegreatplainsitintothegulfofMexicotothesouth.ItbecausetheMissouririveryamuxingdevotesherself,theOhioriverandsizeofmorethan40tributary,soabundantwaterquantity.密歇根湖苏必利尔湖theworld'slargestfreshwaterwatersTheGreatLakesislocatedinCanadaandtheUnitedStatesborderafewlarge-scalefreshwaterlakes,inadditiontothelakeMichiganbelongstotheoutsidetheUnitedStates,otheritforCanadaandtheUnitedStateswere.Thefivelakescomposedoffivegreatlakesistheworld'slargestfreshwaterwaters,withatotalareaof245660squarekilometers,hastheAmericacontinentMediterranean,said.美洲大陆的地中海尼亚加拉瀑布五大湖之间有运河相通，并经圣劳伦斯河与大西洋相连，大型海轮由大西洋可直抵五大湖沿岸，促进了北美的经济繁荣。尼亚加拉瀑布风光尼亚加拉瀑布分为南北两段，北端呈半环状，名马蹄瀑布，属加拿大；南端称亚美利加瀑布，属美国。美、加两国均在瀑布之上修建了大型水电站。NaturalresourcesAmericaisacountryrichinnaturalresources,anditisalsotheimportantenergysuperpower.Suchasminerals,hydraulicandforestresourcesarerelativelyrich,coal,oil,naturalgas,sylvite,phosphate,sulphurreservesareinthecapitalistcountriestop.6.1IronoreMaindistribution:1)thesouthwestarea,thelakesuperiortheregionproduces,accountedforironorethree-quartersofthecountry'stotaloutput.2)'ssecond-largestironminenearBirmingham)locatedinBirmingham.3)inupstateNewYork,PennsylvaniaandtheTennesseeriverbasinallhaveironoredistribution.Landforms&Resourse6.2Non-ferrousmetalMaindistribution:thesouthwestareaofmountainsandtherockymountainArizona,Utah,Montana,NevadaandnewMexicofivestates.IncludingArizonacopperoreproductionaccountsformorethanhalfofnationwide.NaturalresourcesdistributionTheUnitedStatesisleadreservesandproduction'sbiggestcountriesforthereserves5,350tonsoflead,accountingfor36%ofworld.LeaddistributedinMissouriandtheRockyMountainsandtheAppalachianmountainsonbothsidesofthefourteenstates.6.3OilU.S.oilresourcesfor38.88provenreservestons(1978),theworld'sreservesof4.5%.America'soilregionmainlydistributed:thesouthwestandthegulfcoast,andespeciallyconcentratedinTexas,LouisianaandOklahomathreestates.6.4Naturalgas&waterresourcesAmericaiscapitalistworldthecountrywiththemostnaturalgasoutput,butalsoconsumemostpopulouscountry.Therefore,stillneedtogetgasfromCanadaandMexico,andcountriessuchasvenezuelaandAlgeriainnaturalgassupplycontractsigned.U.S.naturalgasproductionbase,roughlyandoilregionmainlydistributedintheTexasconsistent,Oklahoma,CaliforniaandinstatessuchasPennsylvania.IntheUnitedStates,hydraulicpowerresourceofresourceutilizationispoorer,hydrauliccanprovidetheU.S.energyquantityis4.4percent.6.5Coal50stateshave36stateshavecoalresourcesforcoal-firedpower,about50%ofpowerisobtainedbycoal-firedpower.•Sixmajorcoalfieldare:1)eastoftheAppalachiancoalfields,distributionofeightstatesintheeast.Andisthemainproductioncokingcoal;2)thecentralplainsofChina'scoalreservesisoneofthreepoints,butyieldless,coalpoorer;3)therockymountainwestcoalfield,4)northerncoalfield;5)thePaci