Soil is a mixture of organic matter, minerals, gases, liquids, and organisms that together support life. The upper layer of earth in which plants grow, a black or dark brown material typically consisting of a mixture of organic remains, clay, and rock particles. Soil is formed due to the weathering of rocks. Weathering is a process in which physical breakdown and chemical decomposition of minerals take place primarily by wind, water and climatic changes. In the weathering process, rocks are converted to small pieces which eventually turn to soil particles to form a layer of soil.