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Deltas are features of deposition, located at the mouth of the river (so in the lower course) as it
enters a sea or lake. They are made up of three layers: topset, foreset and bottomset.

1. Bottom set: Have finest material, carried furthest in suspension and sinks…

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2. Arcuate delta: these form where the waters are more mixed thus similar densities are created
(so material deposits quicker) and there is stronger wave action ­ these are usually close to the
coastline and less indented, rounded with convex edges. E.g. Ganges.

3. Cuspate delta: strong waves make…

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Deltas are especially favourable for agriculture, due to the deposition of fine sediment, but
at the same time are places of high flood risk as shown by the Ganges Delta.


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