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Why is the water cycle considered a 'closed cycle'?

Answer and explanation

Correct answer: Because water does not escape into space

Direct answer: A, because Earth’s water is largely retained within the Earth system rather than continuously being lost into outer space. In the water cycle, the same water can evaporate, condense, fall as precipitation, flow as runoff, enter the soil, become groundwater, and return to oceans or the atmosphere. It changes location and physical state, but the global supply is recycled. Gravity helps retain water, while the atmosphere, land and oceans exchange it. B is false because the cycle operates in every season. C is false because water is constantly used by organisms and moved through ecosystems; “closed” does not mean unused. D is false because the cycle includes oceans, land, atmosphere, rivers, soil, groundwater, ice and living organisms. Scientifically, small exchanges with space exist, but at school level the Earth’s water cycle is treated as essentially closed. Cue: closed means recycled within the system, not locked in one place.

Related tags

Closed CycleWater CycleGravityEarth SystemHydrological CycleThe Living WorldBiologyClass 11 Mcq

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