Sediment refers to small particles of soil, sand, and minerals that settle at the bottom of rivers, lakes, and oceans. These particles can come from various sources, including weathering of rocks, erosion, and the remains of plants and animals. Over time, sediment can accumulate and form layers, which can provide valuable information about the Earth's history. Sediment plays a crucial role in ecosystems, as it can affect water quality and provide habitats for various organisms. In addition, sediment is important for geological processes, such as the formation of sedimentary rocks, which are created when layers of sediment are compacted and cemented together over millions of years.