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How should the role of Earth's cooling in hydrosphere formation be understood?

Answer and explanation

Correct answer: Cooling allowed water vapour to condense into liquid water

The governing concept is the formation of Earth’s hydrosphere through cooling and condensation. Early Earth was extremely hot, and water existed mainly as vapour released by volcanic outgassing and other processes. As the surface and atmosphere cooled, the vapour could condense into liquid water; continued condensation and rainfall allowed water to collect in basins and form oceans and other bodies. Option A is correct because it identifies the necessary physical change from gaseous water to liquid water. B confuses Earth’s cooling with stellar formation, C concerns an astronomical observation rather than hydrosphere formation, and D incorrectly describes the fate of planetesimals.

Related tags

Earth CoolingHydrosphere FormationCondensationEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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