Limestone is a sedimentary rock primarily composed of calcium carbonate, which often forms from the remains of marine organisms like coral and shells. It is commonly found in various geological formations and can be white, gray, or yellow in color. Limestone is widely used in construction, agriculture, and industry, serving as a key ingredient in cement and lime production. In addition to its practical uses, limestone plays a significant role in natural ecosystems. It can create unique landscapes, such as karst topography, characterized by caves and sinkholes. The rock also acts as a natural filter for water, helping to maintain clean groundwater supplies.