Soil

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Soil

• How much soil is there?

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• How is soil formed?

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Does soil come in different sizes?
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Soil sizes
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Soil sizes

• Sand 0.05 to 2.0 mm diameter

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Soil sizes

• Sand 0.05 to 2.0 mm diameter
• Silt 0.002 to 0.05 mm diameter

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Soil sizes

• Sand 0.05 to 2.0 mm diameter
• Silt 0.002 to 0.05 mm diameter
• Clay lt 0.002 mm diameter

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What are the layers of soil on top of the
lithosphere?
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Layers of soil (horizons)
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Layers of soil (horizons)

• O horizon top layer of litter (leaves,
  decaying plants, etc.)

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Layers of soil (horizons)

• O horizon top layer of litter (leaves,
  decaying plants, etc.)
• A horizon topsoil that contains humus and
  minerals.

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Layers of soil (horizons)

• O horizon top layer of litter (leaves,
  decaying plants, etc.)
• A horizon topsoil that contains humus and
  minerals.
• B horizon subsoil such as clay, loam, or silt.

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Layers of soil (horizons)

• O horizon top layer of litter (leaves,
  decaying plants, etc.)
• A horizon topsoil that contains humus and
  minerals.
• B horizon subsoil such as clay, loam, or silt.
• C horizon weathered parent rock and glacial
  deposits.

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Layers of soil (horizons)

• O horizon top layer of litter (leaves,
  decaying plants, etc.)
• A horizon topsoil that contains humus and
  minerals.
• B horizon subsoil such as clay, loam, or silt.
• C horizon weathered parent rock and glacial
  deposits.
• R horizon Un-weathered parent rocks.