Alluvial deposits are layers of sediment, such as sand, silt, and clay, that accumulate in riverbeds, floodplains, and deltas. These materials are transported and deposited by flowing water, often during floods when rivers overflow their banks. Over time, these deposits can create fertile soil, making areas like river valleys ideal for agriculture. These deposits are important for various ecosystems and human activities. They can support diverse plant and animal life, and they often contain valuable resources, such as gold and gravel. Understanding alluvial deposits helps in managing water resources and predicting natural hazards like floods.