Why do areas near 30° latitude often have deserts?

Near 30° latitude, air that rose near the equator descends as part of the global circulation pattern. As it sinks, it compresses and warms, which lowers its relative humidity and makes cloud formation and rain less likely. This dry, sinking air helps create deserts, so the correct choice is “Air is sinking and drying out as it descends.”

AI-written and checked against the verified answer.