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Temperature gradients which in turn cause pressure gradients. Wind flows across pressure gradients from high to low.

It causes weather. When air is heated up by the sun, it rises up, because heat rises. Cold air is pulled in quickly to replace it, making wind. Also, the sun heats up a water resource and it evaporates above to the cooler air (yes the air above is still cooler because of how separated the molecules are) and cools down to turn into clouds. It becomes very condense and it rains. It is all one big cycle caused by the unequal heating of earth's surface.

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9y ago

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