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WeatheringProcesses that break down rock
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Weathering affects Earth’s landforms
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Mechanical Weathering
Rock is broken apart but not changed chemically
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Plant roots, burrowing animals, and expanding ice all weather rock
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Chemical Weathering
Minerals in rock dissolve or change to other minerals
“Change!” Natural acids Oxygen
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Soil
A mixture of rock Mineral fragments Decayed organic matter Water Air
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Humus
Organic matter is slowly changed to humus
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Soil moisture
VERY important for plant growth
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Soil Profile
The layers are called horizons Most soils have an A, B, & C horizons
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Soil Types
We have many different types of soil They have different textures They have different colors Because they are different mixtures
of clay, silt, and sand
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Climate
determine the type of soil that forms Based on weathering Moisture, etc
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Soil Erosion
A serious problem because topsoil is removed from the land
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Erosion can happen rapidly
On steep slopes Areas not covered by vegetation
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Preventing Soil Erosion
Plant shelter belts Use no-till farming Plant cover crops after harvesting Contour farming terracing