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How Soil Forms

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