Which is not one of the three main factors that cause aridity worldwide?

Name: Which is not one of the three main factors that cause aridity worldwide?
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Question

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Cold ocean currents do not cause aridity. In fact, they can lead to more moisture in the air and contribute to higher precipitation in coastal areas. The other three factors listed (subtropical high-pressure system, mountain rain shadows, and cold and dry continental air) are all known to cause regions to be more arid.

Which Is Not One of the Three Main Factors That