Many use the length of daylight to tell them the time of year. The amount of light can cause them to migrate or grow heavier or different colored coats. The type of land consists of the type of soil, elevation and shape. The type of soil depends on the kind of bedrock from which it was formed and the size of the pieces. The amount of humus it contains and the water it holds are important.
True soil has three definite regions of material.
These three regions are topsoil, subsoil, and bedrock. The topsoil contains any small pieces of bedrock. The smallest pieces are clay. The largest pieces are sand. In between the clay and sand are pieces called silt.