The world's desert regions _____.
A)have always had arid climates
B)are 99 percent covered by active sand dunes
C)are fragile environments
D)have no vegetation
E)have no topographic relief

Question

The world's desert regions _____. ​
A)have always had arid climates
B)are 99 percent covered by active sand dunes
C)are fragile environments
D)have no vegetation
E)have no topographic relief

Quizplus · Accepted Answer

Desert regions are indeed fragile environments. Their ecosystems are highly sensitive to disturbances due to the extreme conditions such as limited water resources. This makes them vulnerable to changes in climate and human activities. Contrary to some beliefs, deserts have not always been arid (climate changes over geological time scales), they are not predominantly covered by active sand dunes (many deserts are rocky, with sand dunes covering a small percentage), they do have vegetation adapted to survive in harsh conditions, and they often feature significant topographic relief, including mountains, valleys, and plateaus.

The World's Desert Regions _____. ​

The World's Desert Regions _____.