Across
- 2. A material that can be broken down by natural processes.
- 5. The layer of the Earth's atmosphere that protects us from harmful ultraviolet radiation.
- 7. The process of breaking down organic matter into compost.
- 8. A type of farming that does not use synthetic pesticides or fertilizers.
- 9. A substance that causes harm to the environment or human health.
Down
- 1. The natural process by which atmospheric gases trap heat close to the Earth's surface.
- 3. The variety of living organisms on Earth.
- 4. A process by which plants absorb water and nutrients through their roots
- 6. The study of the interactions between living organisms and their environment.
- 9. The measure of how acidic or basic a substance is