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| unconsolidated material or organic matter on the immediate surface of the earth that serves as a natural medium of growth for land plants; provides us with food, clothing, shelter |
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- nutrients from debris (leaves, grass, dead animals)
- organic wastes (byproducts from living things)
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- foundation
- road bed
- drainage
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| Water Supply/Purification |
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- supply by surface flow
- purification by percolation
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study of soils as a habitat |
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| study of soils as a natural body |
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| unconsolidated material on bedrock; soil starts on it |
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| Regolith weathers to form ___________. |
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| different layers of soils produced; depends on forces at work |
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| Which layer has most changes? |
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| Which layer has fewest changes? |
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| 3D area of soil large enough to characterize different soil layers |
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| unique names of pedons; given for the town or area where soil was first mapped |
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| 0.05 to 2 mm; gritty feeling |
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| 0.002 to 0.05 mm; floury feeling |
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| < 0.002 mm; important; sticky |
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| major determinant of ecosystem productivity; contains dissolved organic and inorganics; important properties = nutrient supply and pH |
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| CO2 _____________ than atmosphere. |
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| O2 ___________ than atmosphere. |
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| measure of soil's ability to carry out ecological functions |
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