sediment

/ˈsɛdəmənt/

matter that has been deposited by some natural process

中文释义：沉积物；沉淀物

Rivers carry sediment that eventually forms deltas at their mouths.

河流携带沉积物，最终在河口形成三角洲。

The sediment at the bottom of the lake contains fossils of ancient organisms.

湖底的沉积物含有古代生物的化石。