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Question
Delta and an estuary.
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Solution
| Delta | Estuary |
| 1. A delta is a triangular tract of sediments at the mouth of a river. | An estuary is a deep valley formed at the mouth of a river. |
| 2. A delta is formed due to gentle slope of land where river becomes sluggish and mud develops in its channels. | When slope of the land is prominent, water swiftly joins the Sea and there develops a deep valley or an estuary at the mouth of a river. |
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