3. Free electives: Free electives are courses in addition to the Core Curriculum and major requirements sufficient to reach a minimum of 120 credit hours for graduation. Students may graduate with more but not less than 120 credit hours.
Evaporation rates regularly exceed rainfall rates. Sometimes rain starts falling and evaporates before reaching the ground. Rainfall is lowest on the Atacama Desert of Chile, where it averages less than 1.5 cm. Some years are even rainless. Inland Sahara also receives less than 1.5 cm a year. Rainfall in American deserts is higher  almost 28 cm a year.
Some famous deserts are the Gobi and Taklamakan deserts in Asia, the Sahara in northern Africa, and the Great Sandy and Simpson deserts in Australia. Deserts can come and go with changes in climate.The Sahara was once green and filled with animals, as portrayed in wall paintings in its sandstone monuments.ome famous deserts are the Gobi and Taklamakan deserts in Asia, the Sahara in northern Africa, and the Great Sandy and Simpson deserts in Australia. Deserts can come and go with changes in climate.