10-3 pgs. 255-258 IN: In what climate would you expect to find the best soil? From Bedrock to Soil...
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Transcript of 10-3 pgs. 255-258 IN: In what climate would you expect to find the best soil? From Bedrock to Soil...
![Page 1: 10-3 pgs. 255-258 IN: In what climate would you expect to find the best soil? From Bedrock to Soil 01/8/14.](https://reader035.fdocuments.net/reader035/viewer/2022081603/56649f305503460f94c4b1fa/html5/thumbnails/1.jpg)
10-3 pgs. 255-258
IN: In what climate would you expect to find the best soil?
From Bedrock to Soil 01/8/14
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Soil - a loose mixture of small mineral fragments and organic material.
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Bedrock - the layer of rock beneath soil.
Soil
Bedrock
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Not all soils are the same.
The type of soil depends on the type rock that weathers.
Parent Rock- the rock that is the source of soil is called parent rock.
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Humus - very small particles of decayed plant and animal material.
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Topsoil – top layer, contains the most humus.
Subsoil – contains clays and dissolved substances.
Bedrock
Partially weathered bedrock from the parent rock.
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Leaching – the process by which rainwater dissolves and carries away the minerals and nutrients in topsoil.
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Soil also varies because of differences in climate.
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Heavy rains cause soil to move.
Tropical topsoil is very thin.
The vegetation growing in the topsoil keeps the heavy rains from eroding it away.
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Deserts get very little rain.
Very low rates of chemical weathering leads to very rocky soil.
Sometime chemicals are left behind.Such as salt in Death
Valley.
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The most productive soils in the world. Good mix of rain and chemical weathering.
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Soil is thin and is unable to support many plants.
Very slow weathering.
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OUT: In which type of climate would leaching be more common—tropical or desert? Explain.