Soil Formation

Soil Formation

Term Definition
Soil a loose mixture of rock fragments, organic material, water, and air that can support the growth of vegetation. Made from weathered rock.
Parent Rock The source of mineral fragments:or sediments weathered rocks.
Bedrock Is the parent rock because the soil above it is the is formed by the bedrock below.
Residual Soil The soil that remains above its parent rock.
Transported Soil Soil that blown, washed away, or moved by glaciers.
Soil Composition Mixture of rock particles, minerals, decayed, organic material, water, and air.
Humus A dark colored substance that forms as plant and animal remains decay.
Decomposition Organisms that live in soil turn dead organic material into humus.
Fertile Soil Rich in the nutrients that plants need to grow.
Soil Texture Soil quality that is based on the proportions of soil particles.
Loam Made of equal parts of clay,sand, and silt. Crumbly texture that holds air and water. Loam is great for growing plants.
Soil Horizons Layers of soil.
Horizon A Topsoil with humus crumbly dark brown soil that is a mixture of humus,clay, and other minerals.
Horizon B Subsoil usually consists of clay and other particles washed down from Horizon A, but little humus.
Horizon C Rock Fragments contains only partly weathered rock. Forms as bedrock weathers and rock breaks up into the soil particles.
Horizon R Bedrock; solid rock at the bottom.
Litter Loose layer of leaves on the ground from plants.
leaching The removal of substances that can be dissolved from rock or layers of soil due to the passing of water

Leave a Reply

Your email address will not be published. Required fields are marked *