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Under which condition is an estuary more likely than a delta?

Answer and explanation

Correct answer: When tides and waves remove deposits

An estuary forms where a river meets the sea and freshwater mixes with saltwater in a tidal, funnel-shaped mouth. Strong tides, waves, or coastal currents can carry suspended sediment away instead of allowing it to build outward. When deposition is not strong enough to create distributaries and a growing sediment body, an estuary is more likely than a delta.

Option B is correct because tides and waves removing deposits prevent large amounts of silt from settling at the river mouth. High silt supply and a calm sea would favour delta formation, so option A describes the opposite situation. A river must have a mouth to meet the sea, and ending in a lake does not describe a marine estuary.

Related tags

DrainageRiversEstuary

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