Showing posts with label Desert. Show all posts
Showing posts with label Desert. Show all posts

Apr 5, 2013

Not so Sandy Deserts

Believe it or not, most of the Earth’s deserts are not composed entirely of sand. Much, about 85% of them, are rocks and gravel. The largest, the Sahara, fills about 1/3 of Africa and still growing, which would nearly fill the continental United States.