The force of freezing water in the cracks and pores of a rock is an example of

The breakdown of rock by acidic water is an example of

Soil is a mixture of what four materials?

What is the main component of soil?

What is humus?

Three factors that affect the rate of weathering are:

Microorganisms affect the quality of soil by

The movement of air and water through a soil is influenced by the soil's

Contour plowing, strip cropping, and terracing are conservation methods designed to reduce the

Which one is Not a soil conservation method?

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