1.
Deserts are ___________.
Correct Answer
C. Both
Explanation
A desert is a region where the soil is so dry that few plants can grow. Most deserts are very hot, but some are very cold. Deserts near the North and South poles are so cold that water freezes and plants can't grow there.
2.
What is the world's largest desert?
Correct Answer
A. Sahara
Explanation
The world's biggest desert is the Sahara, in northern Africa. It covers about 3 1/2 million square miles (9 million square kilometers). The Sahara is about the size of the United States.
3.
What is sand made of?
Correct Answer
A. Tiny pieces of rock
Explanation
Sand is made up of tiny grains of rock. Most grains of sand were once part of solid rocks that have crumbled. Rocks break and crumble by a process known as weathering. For example, rocks along a coastline wear away when waves hit them. Also, when water freezes in their cracks, rocks can split apart.
4.
What distinguishes the Arabian camel from the Bactrian camel?
Correct Answer
C. Number of humps
Explanation
There are two main kinds of camels, the Arabian camel, also called a dromedary , and the Bactrian camel. The Arabian camel has one hump. The Bactrian camel has two humps.
5.
How many types of cactuses are there?
Correct Answer
B. 2,000
Explanation
Cactuses are plants that grow in North and South America. They usually have clusters, or groups, of spines. There are about 2,000 kinds of cactuses. Most cactuses grow in hot, dry places. Cactuses also grow in rain forests and on mountains. Some cactuses even grow in cold places.
6.
The Sahara used to be filled with lakes and streams. When did the region start turning into a desert?
Correct Answer
C. 6,000 years ago
Explanation
Over 10,000 years ago, the Sahara had lakes and streams. Then, about 6,000 years ago, the region began to turn into a desert. Since that time, the Sahara has been slowly growing larger.
7.
About how much of Earth is covered in desert.
Correct Answer
C. 1/5
Explanation
Deserts cover about one-fifth of Earth.
8.
What is responsible for forming sand into dunes?
Correct Answer
B. Wind
Explanation
Dunes are hills of loose sand. Dunes form when wind picks up sand and then drops it in a pile. They form in deserts and near oceans, rivers, and lakes. Large dunes are up to 1,000 feet (300 meters) high.
9.
What is the area in the desert where underground water is close enough to the surface to allow plants to grow?
Correct Answer
B. Oasis
Explanation
An oasis is a rich, green area in a desert where underground water is close to the surface. This water allows trees and other plants to grow. The water at an oasis first fell as rain or snow in far away mountains or hills. After seeping into the ground, the water slowly moved down through the underground rocks to the desert.
10.
What makes farming possible in the desert?
Correct Answer
C. Irrigation
Explanation
In desert regions, farming would be impossible without irrigation. In areas where it is rainy part of the year but dry part of the year, irrigation allows farming to continue during the dry season.