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How should the role of cool crust in early hydrosphere formation be understood?

Answer and explanation

Correct answer: It provided a base for permanent accumulation of rainwater

The direct answer is A. The early atmosphere contained large amounts of water vapour. As Earth cooled, this vapour condensed into rain. A cool, solid crust provided a surface on which water could collect in depressions and basins, gradually forming the early hydrosphere. Option A is correct because a stable solid surface allowed rainwater to remain and accumulate. Option B is wrong because solar wind comes from the Sun and is not made by crust. Option C is wrong because cooling helped vapour condense; it did not destroy all water vapour. Option D is wrong because the statement confuses surface processes with the deep interior and does not explain hydrosphere formation. The logical chain is: cooling, condensation, rainfall, collection on crust, hydrosphere.

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Cool CrustHydrosphereRainwater

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