What is the dark, organic material that helps make soil fertile?

What are the different layers of the soil profile called?

Which soil horizon has the most fertile soil?

How freely water moves through soil is called

The material from which soil forms is called

A mixture of weathered rock organic matter is called

Which element is humus especially rich in?

What is a primary ingredient of humus?

What effect do plants' roots have on soil?

How would you compare young soil to soil that has been around a long time?

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