WORLD HISTORY

Detailed explanation-1: -Arid regions by definition receive little precipitation-less than 10 inches (25 centimeters) of rain per year. Semi-arid regions receive 10 to 20 inches (25 to 50 centimeters) of rain per year.

Detailed explanation-2: -Some famous arid deserts include the Sahara Desert that covers much of the African continent and the Mojave Desert located in the southwest of the United States. Semi-arid deserts are a bit cooler than hot and dry deserts.

Detailed explanation-3: -One thing all deserts have in common is that they are arid, or dry. Most experts agree that a desert is an area of land that receives no more than 25 centimeters (10 inches) of precipitation a year.

Detailed explanation-4: -The arid environment. Arid environments occur at the poles, along the equator, on mountains, plateaus, below sea level, along coasts, and within mid-continents. They may be hot or cold climate types. Deserts grade imperceptibly into semiarid deserts forming expansive dry lands about the planet.

Detailed explanation-5: -Deserts are areas that are arid. Although the most familiar image of a desert involves hot sand, the Arctic North and Antarctica are also deserts, as they also receive little moisture, usually in the form of snow.