Interrelationships in Earth/Space Systems

3.7 The student will investigate and understand the major components of soil, its origin, and its importance to plants and animals including humans. Key concepts include

a) soil provides the support and nutrients necessary for plant growth;

b) topsoil is a natural product of subsoil and bedrock;

c) rock, clay, silt, sand, and humus are components of soils; and

d) soil is a natural resource and should be conserved.

Science Standards of Learning for Virginia Public Schools – January 2010