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Why can thick, dense clouds appear dark from below?

Answer and explanation

Correct answer: They block a large part of sunlight

Correct answer: A. Clouds contain tiny water droplets, ice crystals, or both. When a cloud is thick and dense, light from the Sun must pass through a greater amount of cloud material. Much of the light is scattered, reflected, or absorbed before it reaches an observer below. Consequently, less light emerges from the underside, and the cloud may look grey or dark, especially when it is thick and moisture-rich. A is correct because the apparent darkness is mainly an optical effect caused by reduced transmission of sunlight. B is wrong because ordinary clouds are not made of rock. C is wrong because cloud droplets and ice crystals come from atmospheric moisture; a cloud cannot be described as vapour-free in this context. D is wrong because clouds form during both day and night. Memory cue: “thicker cloud, less light passing through, darker underside.”

Related tags

Dark CloudsCloud DensitySunlightLight ScatteringClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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