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What is the effect on the rate of evaporation in arid regions or deserts?

Answer and explanation

Correct answer: It is extremely high for available water

Direct answer: B, evaporation is extremely rapid for available water. Arid regions commonly have high temperatures, intense sunlight, low relative humidity and often moving air. Heat supplies energy for liquid water molecules to escape into the atmosphere, while dry air can accept additional water vapour. Wind can also remove moist air from the surface, allowing evaporation to continue. Therefore exposed water and wet soil may dry quickly, even though deserts receive little rainfall. A and C are wrong because dryness does not stop evaporation; it often increases the rate when some water is present. D is wrong because evaporation and condensation are different phase changes: evaporation changes liquid into gas, whereas condensation changes gas into liquid. The total water loss also depends on how much water is available, so “high rate” does not mean deserts contain abundant water. Cue: hot plus dry air promotes fast evaporation, but limited supply causes rapid drying.

Related tags

DesertEvaporationHumidityWater CycleHydrological CycleThe Living WorldBiologyClass 11 Mcq

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