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.
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.