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Answer:

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Explanation:

Sedimentary rocks are laid down in layers called beds or strata. A bed is defined as a layer of rock that has a uniform lithology and texture. Beds form by the deposition of layers of sediment on top of each other. The sequence of beds that characterizes sedimentary rocks is called bedding.

The name of a layer of mud, sand, stones, etc. that forms at the bottom of a river is called a sediment

A sediment is a layer of rock which is formed by the accumulation of other rock particles which have been weathered by either wind, or any other force of nature. They are usually formed at he bottom of water bodies like lakes, etc.

Therefore, your answer is a sediment

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