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What is the primary source of energy that drives the hydrological cycle?

Answer and explanation

Correct answer: The Sun

Direct answer: B, the Sun. Solar radiation supplies the main energy for the hydrological cycle. It heats oceans, lakes, rivers, soil and other wet surfaces, causing liquid water to evaporate. Plants also release water vapour through transpiration, and solar heating supports the circulation of air that transports moisture. When moist air rises and cools, condensation and cloud formation occur; later, precipitation returns water to Earth. Wind helps move moist air, but much of the atmospheric circulation is also linked to solar heating, so wind is not the primary source. Geothermal and tidal energy can affect local processes but do not drive the global water cycle. Memory cue: sunlight lifts water as vapour; gravity brings it back as precipitation and flow.

Related tags

Hydrological CycleSolar EnergyEvaporationWater CycleThe Living WorldBiologyClass 11 Mcq

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