At the equator, the height of the troposphere is approximately ten miles or eighteen kilometers. This increased altitude is caused by intense solar heating, which makes the air expand and rise through powerful convection. Furthermore, the Earth’s rotation creates a centrifugal force that is strongest at the equator, causing the atmosphere to bulge outward more than at the poles. ANSWER: (C) up to 10 miles
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The troposphere reaches its maximum vertical extent at the equator, extending up to ten miles or eighteen kilometers. This phenomenon occurs primarily because the tropics receive the most direct sunlight, leading to extreme surface heating and vigorous vertical air movement. As the warm air expands, it pushes the tropopause higher into the sky. Additionally, the Earth’s rotation generates a centrifugal effect that helps pull the atmosphere further away from the surface at the equatorial belt. In contrast, the cold, dense air at the poles keeps the troposphere much shallower, highlighting the dramatic impact of temperature on structure.
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