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If a lake's outlet is blocked what effect may occur on water and salts?

Answer and explanation

Correct answer: Water may stagnate and salinity may increase

Direct answer: C. A blocked outlet reduces the movement of water out of the lake. First, water may remain stagnant because inflow and outflow are no longer balanced. Next, if the climate permits evaporation, some water leaves as vapour while dissolved salts remain. With less flushing and less dilution by fresh water, salt concentration may rise. Option A is wrong because salinity does not necessarily decrease; in a closed basin it may increase. Option B is wrong because water does not turn into solid stone. Option D is wrong because blocking an outlet cannot instantly transform a lake into a sea. The word “may” is important: the final effect depends on climate, inflow, evaporation, and the amount of salt entering the lake. Memory cue: “Closed outlet means less flushing; evaporation can concentrate salts.”

Related tags

Closed DrainageSalinityLake WaterEvaporationLakesDrainageGeographyClass 9 Mcq

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