why does the southern part of U.S.A has more deserts than the northern part?

Answer 1

It's due to the geographic location that determine the ocean currents through the place.. hence the southern part has more desserts than the northern part..

Answer 2

The only sense here so far is Ravenclaw's first sentence.

Because of the spin of earth and the drag effect of the oceans and atmosphere, which is strongest at the equator where the earth spins fastest, and because of the shape of the continents, there are vast clockwise circulatory movements of water and wind in the North Pacific and North Atlantic. There are corresponding counter-clockwise systems in the South Pacific, South Atlantic and Indian Oceans.

In the case of the North Pacific, the clockwise winds bring high rainfall to the west coast in British Columbia and Washington. Where these winds turn back towards the ocean, further south, the air is coming from the land, not the sea. This is why the American south-west and north-western Mexico are dry.

This corresponds to the North Atlantic system, where the west of the British Isles and Norway take the place of B.C. and Wash. and the Sahara takes the place of the sothwestern deserts (The Mediterranean is like California). With the South Pacific the Atacama is the corresponding desert, with the South Atlantic it's the Namib and Kalahari, and with the Indian Ocean system it's the Australian Desert.

Answer 3

Northern climates that lack moisture lack it not because of heat but because the available water is locked up in ice and snow and doesn't usually get warm enough to melt and become available. And this kind of landscape isn't considered desert. And it needs to be pretty far north. Only Alaska really has places like this, the rest is in Canada, in North America anyway.

Most of the Northern U.S., on the other hand, is temperate climate - not cold enough to be a frozen wasteland, but not hot enough to create deserts. Look at where the world's deserts are around the globe. They mostly fall within this band that centers over the equator. Farther north and south of that, the weather just doesn't make for parched, arid landscapes.

Answer 4

It's all about oceanic tides and wind fronts, which really go hand in hand with each other. Mild, moist breezes create fertile soil, like in California. Dry breezes with extreme temperatures dry out the land.

By the way, global warming is making those deserts expand every second!

Answer 5

Have you ever heard of the big desert between Spokane and Seattle Wash?

Answer 6

Southern US is closer to the Equator

Answer 7

Hotter. Less moisture.

Answer 8

because there are less trees and as a result there drops less water

Answer 9

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