Ngegama le- Umfula Kuyaziwa ngemisinga yemvelo yamanzi aqhubekayo agelezela kokunye okufanayo, okubizwa ngokuthi izilwandle: imifula iyimifula yolwandle, yona eyakha ukungena kwezilwandle, indawo yasemanzini eyakha ama-71% womhlaba womhlaba.
Umhlaba ugcwele imifula futhi amazwe amaningi anezimbalwa zazo, kufaka phakathi lawo mazwe angenawo amandla okungena olwandle, la mazwe abizwa ngokuthi avinjelwe.
Yonke imifula inesakhiwo esingeyayo. Umsuka womfula utholakala engxenyeni ebizwa i-nascent, okuqhubeka yi Yebo, ibanga phakathi komthombo nomlomo.
Esigabeni esiphakeme ungabona ithambeka elihamba phambili nokunyakaza okushesha kakhulu kwamanzi, nokuguguleka okuqonde mpo. Izifundo ezingenhla, uma kwenzeka zomile, izihosha. Maphakathi naphansi kufinyelela emthambekeni kunomnene, ukuthuthwa kuyaqhubeka futhi ukuguguleka komhlaba kuvundlile, kunwebe i- Isigodi. I- isiteshi umgodi amanzi agijima ngawo, futhi umlomo uyindawo umfula othululela kuyo amanzi ayo.
Uhlaka lwama-hydrographic emifula lwenza ukuthi kudingeke ukuthi kusungulwe isivumelwano sokunquma ukuthi yimuphi umfula futhi yimiphi imifudlana nemisinga egelezayo, imisinga yamanzi enikeza ukugeleza iye emfuleni ngaphandle kokuthi kube yiyona eyinhloko. Imvamisa ichazwa nge umfula omkhulu njengokugeleza okukhulu kunakho konke kwamanzi, noma ngobude bawo obukhulu noma indawo yokuhambisa amanzi. Kwesinye isikhathi ubukhulu nokugeleza kwemifula kuyefana nalokho kwemithamo, noma isimo sokugeleza okuphezulu siguqulwa ngokuya kwesikhathi sonyaka. Kungakho-ke kujwayelekile ukuthi imifula efanayo iqanjwe ngezindlela eziningi, noma imifula ebaluleke kakhulu iqanjwe ngezindlela ezahlukene.
Ukuma kwezwe i-America esenyakatho kuyikhaya lenqwaba yemifula, eminingi yayo ehlotshaniswa nebheshi elikhulu laseMississippi-Missouri-Ohio, elihlala cishe amakhilomitha angama-6000. Isifunda esinamachibi amaningi, ikakhulukazi imvelaphi yeqhwa, ehlala eCanada enkulu. Uhlu olulandelayo luzokhombisa izibonelo zemifula eNyakatho Melika, ngencazelo emfushane ebaluleke kakhulu kuyo:
- UMfula iMississippi: Unqamula ingxenye emaphakathi ye-United States. Igijima phakathi kwenyakatho yeMinnesota neGulf of Mexico, enobude obungamakhilomitha-skwele angaba ngu-4,000.
- UMfula uMackenzie: Umfula omude waseCanada, uqhamuke echibini elikhulu leSlave, eNorthwest Territories. Ithululela oLwandle iBeaufort, endaweni yaseCanada.
- Umfula iSt. Lawrence: Yazalelwa e-Ontario, eCanada, futhi ithululela ngqo e-Atlantic Ocean, ngemuva kokuwela okubizwa ngokuthi yiSan Lorenzo river, okuyisikhulu kunazo zonke emhlabeni.
- UMfula iColorado: Cishe ngamakhilomitha angu-2 500 ubude. Lapho idlula eMbusweni wase-Arizona, idala esinye sezimangaliso ezinkulu zemvelo, okuthiwa yi-‘Grand Canyon yaseColorado ’.
- UMfula iMissouri: Umfula onqamula amathafa amakhulu ase-United States. Umcengezi wawo wenzelwa ukunisela ngenkasa, ukulawula izikhukhula, nokukhiqizwa kwamandla kagesi ophehlwa ngamanzi.
- I-Rio Grande
- UMfula iYucón
- UMfula iChurchill
- UMfula iSt
- UMfula iMotagua
- UMfula iGrijalva
- UMfula iSan Pedro
- UNelson River
- Umfula iHudson
- UMfula iPotomac
- UMfula iColumbia
- Umfula iBalsas
- IDetroit River
- Umfula iYaqui
- Umfula i-Arkansas
Ingakusebenzela:
- Imifula yaseNingizimu Melika
- Imifula YaseMelika Ephakathi
