13. 다음 글의 내용과 일치하지 않는 것은?

Deserts cover more than one-fifth of the Earth’s land area, and they are found on every continent. A place that receives less than 25 centimeters (10 inches) of rain per year is considered a desert. Deserts are part of a wider class of regions called drylands. These areas exist under a “moisture deficit,” which means they can frequently lose more moisture through evaporation than they receive from annual precipitation. Despite the common conceptions of deserts as hot, there are cold deserts as well. The largest hot desert in the world, northern Africa’s Sahara, reaches temperatures of up to 50 degrees Celsius (122 degrees Fahrenheit) during the day. But some deserts are always cold, like the Gobi Desert in Asia and the polar deserts of the Antarctic and Arctic, which are the world’s largest. Others are mountainous. Only about 20 percent of deserts are covered by sand. The driest deserts, such as Chile’s Atacama Desert, have parts that receive less than two millimeters (0.08 inches) of precipitation a year. Such environments are so harsh and otherworldly that scientists have even studied them for clues about life on Mars. On the other hand, every few years, an unusually rainy period can produce “super blooms,” where even the Atacama becomes blanketed in wildflowers.

• 1
   There is at least one desert on each continent.
• 2
   The Sahara is the world's largest hot desert.
• 3
   The Gobi Desert is categorized as a cold desert.
• 4
   The Atacama Desert is one of the rainiest deserts.