Sedimentary deposits are layers of materials that accumulate over time, primarily from the erosion and weathering of rocks. These deposits can include particles like sand, silt, and clay, as well as organic materials such as plant remains. They often form in environments like rivers, lakes, and oceans, where water helps transport and settle these materials. As sediment builds up, it can eventually harden into sedimentary rock through a process called lithification. Common types of sedimentary rocks include sandstone, shale, and limestone. These rocks provide valuable information about Earth's history and are important resources for fossils and natural resources.