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Transcript 
How Soils Form
Image: T. Loynachan
Soils-2-1
Physical weathering breaks rocks into
small mineral particles that accumulate
on the Earth’s surface.
Images: Martin Miller, NRCS
Soils-2-2
Chemical weathering dissolves and
changes minerals that have
accumulated on the Earth’s surface.
Images: National Cooperative Soil Survey, University of Nebraska
Soils-2-3
Decomposing organic material from
plants and animals mixes with
accumulated soil minerals.
Images: NRCS, Soil Classifiers of Michigan
Soils-2-4
Accumulated soil materials contain
voids filled with air or water.
Image: T. Loynachan
Soils-2-5
Continued physical and chemical changes
over hundreds to thousands of years
produce layers called soil horizons.
Image: National Cooperative Soil Survey
Soils-2-6
The Formation of Soils
Image: T. Loynachan
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