Trade winds originate in the Subtropical High-Pressure belts (Horse Latitudes). In these regions, air from the upper atmosphere sinks, creating high pressure at the surface. This air then flows toward the low pressure at the equator. Because of the Earth’s rotation, these winds are deflected, providing the steady “trade” flow used by historical mariners. ANSWER: (A) From the subtropical high-pressure zone
From where do the trade winds originate? (A) From the subtropical high-pressure zone (B) From the subpolar low-pressure zone (C) From the equatorial low-pressure zone (D) From the polar high-pressure zone
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The origin of trade winds is tied to the Hadley Cell circulation. Near 30° North and South latitudes, air that rose at the equator has cooled and moved poleward; it then descends toward the Earth’s surface. This descending air creates a “piling up” effect, resulting in high-pressure zones. Since air always moves from high to low pressure, it rushes back toward the heat-induced low at the equator. This constant supply of sinking air at the subtropics ensures that the trade winds remain the most consistent and permanent wind system on the planet.
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