This document discusses the components and properties of soil. It explains that soil provides support and nutrients for plant growth. The five main components of soil are rock, sand, silt, clay, and humus. Humus adds many nutrients to the top layer of soil. There are three main layers of soil: topsoil, subsoil, and bedrock. Natural resources like soil must be conserved through practices like planting trees and grass, healthy farming, and planting gardens.