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What effect can excessive sand mining along river banks cause?

Answer and explanation

Correct answer: Bank erosion and riverbed instability

Sand and other sediment help form and support the riverbed and banks. They also influence the shape of the channel and the way water flows through it. Excessive removal of sand can lower or disturb the bed, weaken bank support, and make the channel more unstable. Faster flow near exposed banks may then increase erosion, and changes in the channel can affect flooding and habitats. The exact result varies with local geology, extraction methods, and flow conditions.

Option A is correct because excessive sand mining can cause bank erosion and instability of the riverbed. The other options are unrelated or use absolute claims: mining does not instantly make river water sweet, increase mountain snow, or guarantee that floods end forever. Sand extraction may provide economic materials, but uncontrolled removal can damage river balance. The supplied explanation and answer A are therefore accurate.

Related tags

DrainageRiversSand-Mining

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