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, like forests and grasslands, occur all around the world. Symmetrical clusters of deserts are found around the Tropic of Cancer and the Tropic of Capricorn-the two latitudes that define the area where the sun's angle at solar noon is closest to ninety degrees overhead at the Equinox.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.