Eluvium refers to the material that has been weathered and transported by the action of water or weather. This term is often used in geology to describe the accumulation of material at the base of hills or mountains. Synonyms for eluvium include alluvium, sediment, deposit, silt, sand, and soil. Alluvium refers to the sediment or eroded material that is transported and deposited by a river, while sediment refers to any kind of earthy material that settles at the bottom of a body of water or stream. Deposit is a broad term referring to the accumulation of material, while silt is specific fine-grained sediment, and sand refers to coarser material. Finally, soil is the material that is found at the surface of the earth, consisting of organic and inorganic material in varying proportions, and often contains nutrients to support plant life.