Soil is the uppermost layer of the earth and is found nearly everywhere on land. It is important because it provides nutrients to living things and supports plants by holding their roots and providing nutrients. Soil is made up of water, air, mineral particles from rocks, and organic matter from dead animals and plants. Many small animals like rats, moles, rabbits, and snakes live in soil, as do insects and worms that help break down organic materials. The texture of soil depends on the size of its mineral and organic particles.