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ATMOSPHERE
Lesson 3 - Page 4

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The Coriolis Effect provides a general wind pattern in belts. The rising moist air at the equator creates a series of low pressure zones along the equator. Water vapor in the moist air rising at the equator condenses as it rises and cools causing clouds to form and rain to fall. After this air has lost its moisture, it spreads to the north and south, continuing to cool, where it then descends at the mid-latitudes

Descending air creates zones of high pressure, known as subtropical high pressure areas. Because of the rotating Earth, these descending zones of high pressure veer in a clockwise direction in the northern hemisphere, creating winds that circulate clockwise about the high pressure areas, and giving rise to winds that blow from the northeast back toward the equator. These northeast winds are called the trade winds. In the southern hemisphere the air circulating around a high pressure center moves toward the left, causing circulation in a counterclockwise direction, and giving rise to the southeast trade winds blowing toward the equator.

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