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Wind exists because of two main forces: The rotation of the earth, and the heat and light from the sun.

The rotation of the earth causes wind because the natural tendency of air molecules is to stay still. The earth essentially is moving, and the air is essentially staying where it is, creating the illusion that the air is moving. This is called "the Coriolis Effect". The Coriolis effect is what causes the constant unchanging winds used by sailing ships.

The heat from the sun is responsible for almost all of earth's weather, except for those mentioned above. The sun's heat causes the air molecules to become excited, and lack of heat makes the molecules stand still. Excited molecules expand, and create High Pressure. Still molecules contract and create low pressure. When high pressure air moves in to fill in the slight vacuum created by low pressure air, it creates wind.

In short

HOT AIR = HIGH PRESSURE

COLD AIR = LOW PRESSURE

HIGH PRESSURE TRIES TO GET TO WHERE THERE IS LESS PRESSURE.

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16y ago

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