by w.batke teacher notes activity soil formation part 1
TRANSCRIPT
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By W.Batke
Teacher Notes
Activity
Soil Formation Part 1
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Soil Formation
What are the two main ingredients that make make up soil?
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Soil Ingredients
Weathered Rock
Humus
Inorganic Organic
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What do the terms organic and inorganic mean?
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Let us look at the Inorganic component:
Over time wind, water and ice break the rock down into smaller and smaller particles
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Finally, all that is left is......
sand, silt and clay.
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In many cases the original weathered rock called the parent material lies below the developing soil.
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Of course this takes long time....
In most cases distinct soil layers develop. These are referred to as soil horizons.
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Can you see the different soil horizons in this diagram?
Horizon A
Horizon B
Horizon C
Weathered Bedrock
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Can you identify the soil horizons?
Horizon A
Horizon B
Horizon C
Weathered Bedrock
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Many times soil profiles are changed by
Floods, Remember the Flood of 1993?
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Soil profiles record these eventsHere is sediment laid down by a flood . Can you think of land in the Hazelwood School District that has been flooded?
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Depending on climate some rock never develop into soil horizons.
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The amount of sand, silt and clay can influence soil texture and use.
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Soils with high sand content
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Soils with high silt content
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Soils with high clay content
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But our picture is not complete.
Without the organic component, the soil is unproductive.
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Next time we will look at the organic component.
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Teacher notes:
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*Slides that do not advance automatically must be advanced manually by left clicking on the mouse button.
*Back arrows on each slide move to previous slide.
*Topics are intended to be discussed in class and science journal notes or records are encouraged.
*Programs may be viewed in any sequence although they tend to build upon one another.
Soil Importance, Soil Formation Pt.1, Soil Formation Pt.2
Soil Conservation, Soil Problems
More
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Here are some additional resources on the web
http://www.hintze-online.com/sos/soils-online.html
http://nscss.org/ssource.html
http://www.bsyse.wsu.edu/~saxton/soilwatr/
If you have questions, comments, please send to
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