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.
1 Desert is the driest and hottest of areas. 2  The world's largest desert is the Sahara in North Africa. 3  Areas of scrub land that border the desert are called desert scrub. 4  Mediterranean climates are not too hot or cold. 5  They are found around the Mediterranean Sea, near Cape Town in South Africa and Melbourne in Australia.