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29 Cards in this Set
- Front
- Back
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What are the two types of weathering?
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Chemical and Mechanical
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What are the 4 types of mechanical weathering!?
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ice wedging
abrasion pressure release plant root growth |
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process by which natural forces break down rocks
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weathering
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the breaking up of rocks by physical forces
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mechanical weathering
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process in which layers or sheets of rock gradually break off
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exfoliation
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process of wearing down by friction
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abrasion
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the breaking down of rocks by chemical reactions
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chemical weathering
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decayed organic matter in soil
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humus
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layer of soil with properties that differ from those of the layer above or below it
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soil horizon
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soil horizons in a specific location make up what geologists call a
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soil profile
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non examples of weathering
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jackhammer dynamite
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examples of weathering
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rusted chair, cracked sidewalk
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splits rocks as roots grow into it
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plant root growth
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the expansion of water when it freezes forces rock to split apart
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ice wedging
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friction the rubbing of one object to another
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abrasion
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exfoliation causes layers of rock to break off
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pressure release
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properties that influence soil
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texture
color pore space chemistry |
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how easily air and water move through
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texture
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how well water moves through and indicates composition
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color
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water and air move through pore spaces
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pore space
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makes it more acidic with acid
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chemistry
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3 types of organisims affecting soil
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plants microorganisms and animals
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plants
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organic matter that gets broken down to form humus, return nutrients to the soil
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microorganisms
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decompose dead plants and animals; return nutrients to the soil
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animals
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homes are in soil loosen and mix the soil. return nutrients to the soil
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example of soil horizons
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dead leaves
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largest to smallest weathered rock particles (texture)
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sand silt clay
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how fast water floods through the soil
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permeability
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how much water does the soil absorb
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water retention
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