What organism is primarily responsible for mixing the humus in the soil?

In which soil layer would you expect to find the most humus?

What is loam?

What type of weathering is BEST at weathering marble and limestone?

Why do farmers leave the weeds and stalks of the previous year's crop in the ground during conservation plowing?

Where does humus come from?

Rust forms from the oxidation of what metal?

Why do farmers use crop rotation?

What is soil exhaustion?

What is the name for the top layer of soil?

What is the name for the 2nd layer of soil?

What is the name for the 3rd layer of soil?

What is the bottom layer of solid rock beneath the soil called?

What is another name for the A horizon?

What is another name for the B horizon?

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