Central Valley: thaj chaw, kev nyab xeeb, tshwj xeeb yog

Central Valley - ib thaj av nyob rau hauv qhov chaw ntawm North America. Nws yog ib tug uas tsis muaj-dag struts, muaj li ntawm nras ntawm ntau hom: Moraine, pas dej, loess thiab outwash. Nyob rau hauv sab qaum teb-sab hnub tuaj ciam teb ntawm lub Appalachian roob system nyob rau hauv sab qab teb-sab hnub tuaj - nrog Laurentian toj. Cov yav qab teb ciam nce mus txog lub Gulf Nqaum Tiaj. Nyob rau hauv sab qaum teb, txojkev Great teb chaws qhov chaw.

Nras ncab ntawm lub US thiab Canada. Qhov twg koj yuav nrhiav tau ib tug loj tsam, uas yog lub npe hu rau nws nyob deb nroog economic kev ua ub no. Qhov no cheeb tsam yog zoo heev tsim. Qhov no yog facilitated los ntawm nyem, thiab climatic tej yam kev mob. 75% ntawm tag nrho ib ncig ntawm cov nplooj nyob rau hauv qhov kev koom thiab liaj teb. Lub nto moo tshaj plaws lub nroog, yog nyob ntawm no, yog Chicago. Yog li ntawd, cia saib specifics ntawm lub chaw uas zoo heev.

Nta thiab topography ntawm lub Central Nras

Central Valley nruab nrab qhov siab ntawm 150-500 m. Lawv muaj li ntawm cov pob zeb ntawm Upper thiab Lower Paleozoic uas yog txheej txheem horizontally thiab ib nrab inclined rau sab qaum teb. Nyob rau hauv lub northeast, qhov twg lub nras mus txog lub Great Lakes cheeb tsam nyem yog nyob rau hauv daim ntawv ntawm ntiav ridges nrog asymmetrical slopes - cuesta. Lawv muaj li ntawm cov pa roj carbon fiber, Silurian thiab Devonian sediments. Qhov tseem hais Cuesta tsim Silurian sediments. Nyob rau ib tug ntawm lawv, ntawm cov kev tshuam ntawm nws cov dej Niagara, nws tsim ib lub npe nrov tshaj attractions ntawm North America - Niagara Falls.

Central Valley rau lub feem ntau yog ib feem them nrog strata ntawm glacial deposits. Nws yog ib lub bedrock qab. Qhov no qhia tias cov cheeb tsam no tau hais ntau ntau zaus raug yog them los ntawm glaciers, tej zaum, nyob rau hauv lub Pleistocene lub sij hawm.

Lub cheeb tsam - lub feem ntau densely populated cheeb tsam ntawm North America. Qhov tseeb sawv dabneeg. Cov neeg no nyiam fertile av mus, thiab tau ntev lawm hauv lub cheeb tsam no yog siv rau ua liaj ua teb. Tam sim no, ntau tshaj 90% ntawm lub hauv paus txawm nroj tsuag puas lawm, thiab lub hav zoov-steppe thiab hav zoov hloov los ntawm qoob loo nroj tsuag.

Lub hauv paus nras yog cuam kawb, dissected los ntawm hav dej nyem. Lawv muaj li ntawm sedimentary pob zeb - limestone. Tsuas yog nyob rau hauv lub yav qab teb ib feem ntawm qhov chaw ntawm lub pob zeb lub ntsej muag mob rocky - roob Boston, uas yog ib tug spur ntawm lub Appalachian system. Nruab nrab qhov siab nce mus txog 600-800 m.

kev nyab xeeb

Climatic tej yam kev mob nyob rau hauv lub cheeb tsam hloov nyob rau hauv lub latitudinal kev taw qhia. Nws yuav tsum tau muab sau tseg hais tias lawv yog sufficiently paaj. Great cawv rau hauv lub tsim ntawm kev nyab xeeb muaj txias thiab sov currents los ntawm lub Atlantic. Lub caij ntuj sov nyob rau hauv Central Plains sov nruab nrab kub ntawm +20 ... + 22 ° C. Nyob rau hauv lub yav qab teb cheeb tsam tus pas ntsuas kub yuav sawv kev mus +28 ° C. Lub caij ntuj no nyob rau hauv cov cheeb tsam no yog txias thiab frosty. Yuav luag thoob plaws lub sij hawm khaws cia kom khov kub. Nruab nrab isotherm Lub ib hlis ntuj - -12 ... -16 ° C. Qhov nruab nrab txhua xyoo dej nag yog 750-900 hli. Feem ntau ntawm lawv ntog nyob rau hauv lub caij ntuj sov, tab sis nyob rau hauv lub caij ntuj no nws snows feem ntau, txoj kev ua ib tug ruaj khov snowpack. Qhov zoo thiab qhov Central Valley muaj es zoo xws li cov kev nyab xeeb.

natural resources

Qhov no cheeb tsam yog ntawm kuj zoo kawg economic tseem ceeb. Central Valley nyob rau deposits ntawm thee, roj thiab cov nkev. muaj kuj mined rooj ntsev thiab barite. Thee deposits yog nyob rau hauv lub northeast, nyob ze rau lub roob system ntawm lub Appalachians. Ib tug loj roj teb nyob rau hauv sab qaum teb ntawm lub Central Plains.

Muaj thiab fauna

Cov Central Plains cheeb tsam belongs rau lub cheeb tsam ntawm deciduous thiab mixed forests. Txawm li cas los, lub hauv paus nroj tsuag fwm xwb nyob rau hauv chaw me me, faib farmland thiab pastures. Liaj teb cog nrog cereal cov qoob loo, pob kws. tsuas nas kis ntawm muaj.

Central Valley - qhov tseem ceeb tshaj ua liaj ua teb cheeb tsam ntawm lub tebchaws United States. 85% ntawm tag nrho cov ua liaj ua teb khoom ua nyob rau hauv cov cheeb tsam no.