Why is a delta formed by a river in a triangular shape?
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the delta formed is not always triangular but most of the times it is triangular and that's due to the rivers slow down at their mouth and fan out in smaller branches due to silt deposition giving it a triangular appearance.
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Many deltas are roughly triangular because rivers slow down and fan out– often branching into smaller streams amidst the delta sediments– when they reach a standing body of water. However, the shape of a delta really depends on various depositional and erosional forces, including the river but also including forces such as waves and tides
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