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Questions and Answers
Which of the following best describes the role of earthworms in soil health?
Which of the following best describes the role of earthworms in soil health?
- Earthworms create topsoil by ingesting particles of soil and expelling nutrient-rich casts.
- Earthworms release oxygen into the soil through their respiration.
- Earthworms protect the soil from erosion by burrowing deep into the ground.
- Earthworms help to break down organic matter in the soil. (correct)
What percentage of the earth's surface provides the soil we rely on for agriculture?
What percentage of the earth's surface provides the soil we rely on for agriculture?
- 20 percent
- 50 percent
- 7.5 percent (correct)
- 95 percent
What is the main threat to topsoil?
What is the main threat to topsoil?
- Overuse of chemical fertilizers
- Erosion caused by wind and water (correct)
- Proliferation of harmful bacteria
- Lack of organic matter in the soil
What percentage of our food is grown using topsoil?
What percentage of our food is grown using topsoil?
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How long does it take to create an inch of fertile topsoil?
How long does it take to create an inch of fertile topsoil?
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