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.
They have cool winters and long, warm summers. Coastal deserts are located on the west coasts of continents at latitudes of 20Â° - 30Â°. Winds off the coast blow in an easterly pattern and prevents the moisture from moving onto the land. The Namib Desert in Africa and the Atacama Desert in Chile are coastal deserts.