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Arable soils with water content suitable to grow a 3 month growing season. Takes a long time to develop. Covers 10% of the earth.
- Weakly weathered volcanic ejecta and vocaniclastic materials mixed with strongly weathered materials.
- Good for agriculture. covers 2% of the US.
Form in arid climate. prodominant in deserts. water deficient. low organic matter.
Of recent origin. Usually has no genetic horizons other thatn A or C. covers 18% of the earth.
Cold climate soil with permafrost. within the top 2 meters of soil surface.
Low density, Large carbon sink, dominated by organic matter. Found mainly in the midwest, atlantic gulf coast. less than 1% of US
Minimal horizon development. found on steep slopes and young geographic surfaces or resistant parent material.
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