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.
The four major North American deserts of this type are the Chihuahuan, Sonoran, Mojave and Great Basin. Others outside the U.S. include the Southern Asian realm, Neotropical (South and Central America), Ethiopian (Africa) and Australian. The seasons are generally warm throughout the year and very hot in the summer.
Deserts. A desert is a hot area of land that gets very little rainânot more than 200 mm a year. Temperatures during the daytime can get as high as 55Â° C. At night, deserts cool down, sometimes even below 0Â° C. Deserts cover about 20% of the worldâs land.ost deserts lie between 15Â° and 35Â° north and south of the equator. They were created by air that rises over the equator and comes down over the Tropic of Cancer and the Tropic of Capricorn. All over the world many deserts lie in these regions. 1  Land over the equator becomes very hot.