Desert
The desert ecosystem has the driest climate. It is here that equatorial air falls down toward the Earth’s surface and rainfall is rare because rain usually occurs when air begins to rise, not fall. The equatorial air that is falling prevents most air from rising. North Africa, southwestern North America, the Middle East, and Australia support the largest deserts. Rainfall in the desert often totals a few inches yearly or, in some regions, there is absolutley none. Desert soils are often salty because whatever little rain that does fall quickly evaporates from the ground, leaving salt and other minerals behind.
Ecosystems 
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