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Why does air rise in orographic rainfall?

Answer and explanation

Correct answer: A mountain forces it to climb

Correct answer: D, a mountain forces moist air to climb. Orographic rainfall is also called relief rainfall. First, moist air moves toward a mountain or other raised landform. The mountain acts as a physical barrier, so the air cannot continue horizontally at the same level and is forced to rise along the slope. As the air rises, it expands and cools. Cooling can cause condensation, cloud formation, and eventually precipitation on the windward side. A is wrong because the Sun does not push the air downward in this process. B is wrong because the sea does not need to freeze and freezing is not the cause of the uplift. C is wrong because a desert is not the landform responsible for orographic uplift. D correctly names the mountain barrier and the upward movement. The question asks why air rises, not every later step of rainfall formation. Memory cue: “orographic = obstacle of relief; mountain makes air rise.”

Related tags

Orographic RainfallMountainsAir UpliftRelief RainfallClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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