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2:2 Weathering

Soil Formation and Composition

TermDefinition
soil The loose, weathered material on Earth’s surface in which plants can grow.
Bedrock The solid layer of rock beneath the soil.
Humus The dark-colored substance that forms as plant and animal remains decay.
loam Soil that is made up of about equal parts of clay, sand, and silt.
Soil horizon A layer of soil that differs in color and texture from the layers above or below it.
Topsoil Mixture of humus, clay, and other minerals that forms the crumbly, topmost layer of soil
Subsoil The layer of soil beneath the topsoil that contains mostly clay and other minerals.
Litter The loose layer of dead plant leaves and stems on the surface of the soil.
Decomposer Organisms that break the remains of dead organisms into smaller pieces and digest them with chemicals.
Created by: backusbro12
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