Question

question:
the buildup of sediment known as a river ___ forms at the mouth of a
river where it slows down.

answer input:
spelling counts but capitalization doesnt.
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Explanation:

In geography (a subfield of Natural Science), a river delta is a landform that forms at the mouth of a river where the river slows down and deposits sediment. This is a key concept related to river processes and landform formation.

Answer:

delta