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 of the world's largest deserts are cold deserts located at one of the Earths poles or in a cold area of the world. One thing is for sure, deserts are dry and barren places. Go here for more information on the desert habitat.alahari Desert. The Kalahari Desert is located in Southern Africa. Like many deserts, it has large temperature swings, with temperatures dropping to zero at night and then rising to above 40 degrees C (104 degrees F) in the day.