Transcript Soil - My CCSD

Soil
Soil Formation
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Water weathers rock
Plants start growing in rock
Leaves fall and rot, adding humus
Animals start to move in, adding more
humus.
Soil Profile
Top – Most mature, lots of humus
2nd – Subsoil – little humus, lots
Of weathered rock
3rd- Big weathered rock
4th - solid rock
What’s Soil Made of?
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1. Weathered Rock
2. Air
3. Water
4. Humus
decayed
plant and
animal material
Don’t get this confused with “hummus” which is chick peas
Immature Soil
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Lacks Humus
More rocky
Dry
Lighter in color
Sandy
Higher Density
Mature Soil
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High amount of Humus
Low density due to air pockets
Fluffy
Soft
Damp
Darker in color