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What do tributaries of Himalayan rivers do?

Answer and explanation

Correct answer: They add water and sediment to the main river

A tributary is a smaller stream that joins a larger main river. As it joins, it contributes its own flowing water and may also bring transported sediment such as sand, silt, and clay. This can increase the discharge and sediment load of the main river, although the amount depends on rainfall, landforms, rock type, and erosion in the tributary basin. Tributaries therefore help build the drainage network rather than ending the main river.

The correct choice is D: tributaries add water and sediment to the main river. They do not normally terminate the main channel, and they do not always travel separately to the sea. A river cannot be turned into mountains by a tributary. The key idea is the meaning of “tributary”: it is a contributing branch that flows into a larger stream and strengthens the main drainage system.

Related tags

TributariesMain RiverSediment

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