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Why does a leeward slope receive less rainfall?

Answer and explanation

Correct answer: Air has already lost moisture

The direct answer is B: the air has already lost much of its moisture. A leeward slope lies on the sheltered side of a mountain. Step by step, moisture-laden wind reaches the windward side, is forced upward by the mountain, expands and cools, and gives rain. After losing water vapour, the air crosses the ridge and descends on the leeward side. Descending air becomes warmer and relatively dry, so little rain falls there. This dry area is called a rain-shadow region. Option A is wrong because being surrounded by sea is not the defining reason for low rainfall on a leeward slope. Option B is correct because it states the central process. Option C is wrong: cyclones do not arrive every day and are not required for the leeward effect. Option D is wrong because sunlight is not absent there and is not the main explanation. Exam cue: windward means rising moist air and more rain; leeward means descending dry air and less rain.

Related tags

Leeward SlopeRain ShadowLow Rainfall

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