A ring of deserts is then instantly formed by the air quickly flowing 30° north or south.
Wind is caused by the uneven heating of the Earth's surface, which creates pressure variations throughout the atmosphere and causes air parcels to move from locations of greater pressure to those of lower pressure.
Deep, icy water rises to the surface during an upwelling process. This diagram demonstrates how nutrient-rich, cold water that "wells up" from below replaces displaced surface waters.
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