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.desert


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: