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How Soil Forms

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Across
5
Organisms that break down animal and plant remains
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Layer of soil with clay and other particles, but little humus
8
Soil made of about equal parts clay, and silt
Down
1
The solid layer of rock beneath the soil
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Decayed plant and animal remains
3
Crumbly, dark soil that is a mixture of humus, clay, and other minerals
4
A measure how well soil supports plant life
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A scale used to measure soil acidity