Summary. Five layers of soil: Humus is on top of soil where leaves and roots are. Surface soil (typically darker black when rich with nutrients) - composed of inorganic material, organic material, water, and air. Subsurface soil (less organic material and larger rocks are present.
COMMENTS
Summary. Five layers of soil: Humus is on top of soil where leaves and roots are. Surface soil (typically darker black when rich with nutrients) - composed of inorganic material, organic material, water, and air. Subsurface soil (less organic material and larger rocks are present.