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Soils

Soils. Soil: A loose mixture of small rock fragments, organic matter, and air that supports the growth of vegetation.

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Soils

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  1. Soils • Soil: A loose mixture of small rock fragments, organic matter, and air that supports the growth of vegetation.

  2. Humus: The remains of decayed organic matterLoam: Soil composed of sand, silt, and clay in equal proportionsParent Material: The weathered rock or the decaying organism that broke down to make the soil

  3. Soil Horizons: Layers of soil that have different propertiesA horizon: Top of the soil profile, has the most decayed matter (humus), abundant plant roots increasing weathering of material.B horizon: Below the A horizon, less humus, has more iron minerals and clayC horizon: least developed, large rock fragments, usually no organic matter.Bedrock: the parent material for rock particles in the soil.

  4. Porosity: how much water can the soil holdPermeability: How easy does the water drain- The larger the particles are the easier it drains.Largest to smallest: GravelSandsiltclay

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