👉 The term "sediments" refers to organic matter, such as sand and silt, that has been deposited in bodies of water or other environments over time. These deposits can include sedimentary rocks, which are composed primarily of sandstone and shale, but they can also include various other types of sediment, including clay, silt, and gravel. Sediments provide a crucial layer of organic matter to the Earth's crust, as well as essential nutrients for aquatic life.