Hidrografia do continente Americano
Autor: Profª IEDA | Publicado: 2012-07-27T21:21:00-03:00

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Um rio com seus afluentes forma uma rede hidrográfica. A
área drenada por uma rede hidrográfica recebe o nome de bacia hidrográfica. Um
conjunto de bacias hidrográficas, cujos rios correm para o mesmo destino, que
pode ser um oceano ou um mar, constitui uma grande vertente. De modo geral, o
continente americano possui uma hidrografia farta, pois suas terras são
drenadas por numerosos rios.
As Vertentes podem ser entendidas como o conjunto de formas do relevo, que
orientam o deslocamento de um rio. As vertentes do continente americano são:

Vertente do Ártico: Rios em grande parte congelados, muito importante
para a pesca (Salmão) e para produção de energia (Mackenzie e Nelson) 
&nbsp;

Vertente do pacífico: Rios que nascem e descem as montanhas próximas,
por esta razão são curtos e com cachoeiras.
&nbsp;

Vertente do Golfo: Formada por rios que atravessam a planície do
Mississipi, importante para a agricultura (Missouri/Mississipi)
&nbsp;

Vertente do Atlântico: Abrigam os rios mais extensos e importantes do
continente, grande aproveitamento econômico, transporte, pesca e energia (São
Lourenço, Amazonas, Bacia Platina).