soil, is the upper layer of the earth's surface., Humus, is the top layer made up decaying plants and is very thin., Top soil, is dark and rich in nutrients. Plants roots grow here and organism like to live there., Subsoil, is light in color and is made up of clay, iron and organic matter., Parent material, is mostly made of large rocks. This material breaks down in soil. Plants roots do NOT grow there., Bedrock, is solic rock at the bottom. This is NOT soil.

Soil

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Soil Layers
Soil Layers
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Soil Layers!
Soil Layers!
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按组分配
layers of soil
layers of soil
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Soil
Soil
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Layers of Soil
Layers of Soil
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按组分配
Soil Horizons
Soil Horizons
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Soil Layers
Soil Layers
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Layers of Soil
Layers of Soil
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