Download - Naturalists at Large: Soil composition
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4th Grade
Springville, Utah
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Where does soil come from?
•Rocks•Minerals
•Organic Matter
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oA
E
B
C
R
TOP SOIL
SUBSOIL
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Sagebrush-Cold Desert
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What are the main components of soil?
• Mineral Matter
• Air
• Water
• Organic Matter
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SOIL COMPONENTSidealized soil
SOIL SOLIDS
WATER FILLED PORES
AIR FILLED PORES
50 %
25 %
25%
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Soil Components (volume basis)
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Note: clays are microscopic in size !
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Soil separate particle diameter (mm)____________________________
Sand . . . . . . . . . 2.0 - 0.05
Silt . . . . . . . . . . 0.05 - 0.002
Clay . . . . . . . . . . <0.002
SAND
SILT CLAY
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Clay mineralsphotographedwith an electronMicroscope.
Note: they are plateor flake like andare stacked on topof each other.
They are electricallycharged and act likemagnets that attractand hold plantnutrients.
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What causes soil erosion?
WaterWind
No Vegetation
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How did the Canyon Lands of Utah form?
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What are the FACTORSthat make SOIL?
TIME1000’S TO 10,000’S OF YEARS
LAY OF THE LANDTOPOGRAPHY
LIVING ORGANISMSANIMALS AND PLANTS
CLIMATEHOT/COLD, WIND/RAIN
PARENT MATERIALROCKS AND MINERALS
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Physical land features
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What are some practices
Of
SOIL CONSERVATION?
TerracingStrip Cropping
Contour PlowingTilling
Wind BreaksGround Covers
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Internet Sites
• http://www.tx.nrcs.usda.gov/class/sammy.htm