What causes storms to form most often near the equator and 60° latitude?

Storms often form where air rises. As warm, moist air rises, it cools, and water vapor condenses into clouds; this process can produce precipitation and storms. Near the equator, strong solar heating makes air rise, while near 60° latitude, converging air masses also force air upward. So the correct choice is “Air rises and cools to form clouds.”

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