Which causes the most widespread aridity geographically?

Question

Quizplus · Accepted Answer

The subtropical high-pressure system causes the most widespread aridity geographically as it occurs in regions between 20 and 35 degrees north and south of the equator, known as the subtropics. In these regions, the descending dry air from the high-pressure system results in arid conditions and desertification. This affects areas such as the Sahara, Arabian, and Australian deserts. Mountain rain shadows, cold and dry continental air, and cold ocean currents can also contribute to aridity in specific regions but do not have the same widespread geographical impact as the subtropical high-pressure system.

Which Causes the Most Widespread Aridity Geographically