united states

united states

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时间:2017-07-28

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1、UnitedStates

2、Geography

3、

4、People

5、

6、Government

7、 

8、Economy

9、 

10、Communications

11、

12、Transportation

13、 

14、Military

15、

16、TransnationalIssues

17、Geography[TopofPage]Location:NorthAmerica,borderingboththeNorthAtlanticOceanandtheNorthPacificOcean,betweenCanadaandMexicoGeographiccoordinates:3800N,9700WMaprefere

18、nces:NorthAmericaArea:total:9,629,091sqkmland:9,158,960sqkmwater:470,131sqkmnote:includesonlythe50statesandDistrictofColumbiaArea—comparative:aboutone-halfthesizeofRussia;aboutthree-tenthsthesizeofAfrica;aboutone-halfthesizeofSouthAmerica(orslightlylargerthanBrazil);slightlylargert

19、hanChina;abouttwoandone-halftimesthesizeofWesternEuropeLandboundaries:total:12,248kmbordercountries:Canada8,893km(including2,477kmwithAlaska),Cuba29km(USNavalBaseatGuantanamoBay),Mexico3,326kmnote:GuantanamoNavalBaseisleasedbytheUSandthusremainspartofCubaCoastline:19,924kmMaritimec

20、laims:contiguouszone:12nmcontinentalshelf:notspecifiedexclusiveeconomiczone:200nmterritorialsea:12nmClimate:mostlytemperate,buttropicalinHawaiiandFloridaandarcticinAlaska,semiaridinthegreatplainswestoftheMississippiRiverandaridintheGreatBasinofthesouthwest;lowwintertemperaturesinth

21、enorthwestareamelioratedoccasionallyinJanuaryandFebruarybywarmchinookwindsfromtheeasternslopesoftheRockyMountainsTerrain:vastcentralplain,mountainsinwest,hillsandlowmountainsineast;ruggedmountainsandbroadrivervalleysinAlaska;rugged,volcanictopographyinHawaiiElevationextremes:lowest

22、point:DeathValley-86mhighestpoint:MountMcKinley6,194mNaturalresources:coal,copper,lead,molybdenum,phosphates,uranium,bauxite,gold,iron,mercury,nickel,potash,silver,tungsten,zinc,petroleum,naturalgas,timberLanduse:arableland:19%permanentcrops:0%permanentpastures:25%forestsandwoodlan

23、d:30%other:26%(1993est.)Irrigatedland:207,000sqkm(1993est.)Naturalhazards:tsunamis,volcanoes,andearthquakeactivityaroundPacificBasin;hurricanesalongtheAtlanticcoast;tornadoesinthemidwest;mudslidesinCalifornia;forestfiresinthewest;flooding;permafrostinnorthernAlaskaisamajorimpedimen

24、ttodevelopmentEnvironment—

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