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sediment
n
Example
The geologist studied the sediment at the bottom of the lake to learn about its history.
Over time, sediment builds up in the bottom of a pond, affecting its water quality.
After the river flooded, a layer of sediment covered the riverbed.
Archaeologists sifted through layers of sediment to uncover ancient artifacts.
Heavy rainfall can lead to erosion, washing sediment into nearby streams.
