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Section 12.2 Soil

Section 12.2 Soil. Soil loose weathered rock and organic matter Parent material the material in which soil is formed from. How soil forms. Residual soil Soil sits above the bedrock it was formed from Transported soil Soil has been transported to a new location.

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Section 12.2 Soil

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  1. Section 12.2Soil

  2. Soil loose weathered rock and organic matter Parent material the material in which soil is formed from. How soil forms

  3. Residual soil • Soil sits above the bedrock it was formed from • Transported soil • Soil has been transported to a new location Where soil comes from

  4. If a soil is composed of mainly sand (from weathered sandstone rock) and the underlying bedrock is composed of granite is the soil Transported or Residual Soil? Checkpoint #1

  5. Soil profile • cross section of the soil that makes up a particular area • Soil horizons • individual zones or layers that make up the soil profile

  6. Topsoil • Ahorizon • top layer dark in color • contains humus (organic matter) • Subsoil • Bhorizon • red or brownish due to greater iron content • contains clay • C horizon • Older layer • larger fragments of rock Types of soil

  7. Soil Profiles Horizon A- Hummus(Soil)- contains organic material Horizon B- Subsoil- Not as rich in nutrients, made of well weathered rock Horizon C- Partially weathering rock Bedrock- Rock that has not been weathered

  8. Checkpoint #2 Horizon ___ Horizon ___ Horizon ___ Fill in the blanks!

  9. Soil is dependent on the climate • Temperature • Precipitation • Plant matter • Bedrock Soil composition

  10. Checkpoint #3 Soil is formed primarily by 1 erosion by glaciers erosion by running water 2 3 capillarity and human activity weathering and biological activity 4

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