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What is the direction-based difference between a tributary and a distributary?

Answer and explanation

Correct answer: Tributary joins the main stream and distributary branches away from it

Direct answer: A. A tributary joins the main river and adds water to it, while a distributary leaves the main channel and carries water away, commonly across a delta. Follow the flow direction: if water moves into the main stream, the branch is a tributary; if water moves out from it, the branch is a distributary. A states this exact difference. B is wrong because only a distributary branches away; a tributary joins. C is wrong because rivers do not normally rise from the sea, and neither term is defined that way. D is wrong because a water divide is high land separating drainage basins, not a type of tributary or distributary. Memory cue: tributary contributes water; distributary distributes water away.

Related tags

TributaryDistributaryRiver System

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