Because of the cool air and the position of the Andes mountain located to the east are on the leeward side of the range, which means that the region between the shore and the mountains receives little rainfall.
The side of a mountain that faces away from the wind is referred to as the leeward side. This side is also known as the rain shadow side. Imagine that warm, wet breezes are carried up the windward side of the mountains, where they cool off and finally form rain. They have very little moisture remaining and are colder as they get to the opposite side of the mountain, which is the leeward side.
This is true of the South American peninsula that lies between the Andes Mountains and the shore. The majority of this strip of land is a desert and receives less than 0.6 inches of rain annually since it is on the leeward side of the island, which receives cold air and minimal precipitation.
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