SOIL IS MADE UP OF LAYERS

Soil is made up of three layers, each containing different materials:

• Topsoil: This top layer contains sand, clay, water, air and humus.
• Subsoil: This middle layer contains stones, sand, clay and some water.
• Bedrock: This bottom layer is made up of rocks, and contains very little water.

A: TOPSOIL; B: SUBSOIL; C: BEDROCK.
Photo from Wikipedia