Across
- 10. The cutting down of forests, often for farming or building.
- 11. The natural world around us, including air, water, and land.
- 12. No longer existing; used when a species has completely died out.
- 13. A powerful greenhouse gas released by animals and decaying matter.
- 17. A substance that can cause cancer.
- 19. The average weather conditions in a region over a long period.
Down
- 1. A variety of different types of things, often used to describe species.
- 2. The natural home or environment of an animal, plant, or organism.
- 3. A place where garbage is buried underground.
- 4. Related to or coming from living things; often used to describe natural foods.
- 5. A community of living things and their environment working together.
- 6. Energy sent out as waves or particles, sometimes harmful.
- 7. A type of air pollution made from smoke and fog.
- 8. Something that makes air, water, or soil dirty or unsafe.
- 9. Poisonous or harmful to living things.
- 14. The wearing away of land by wind, water, or ice.
- 15. A black fossil fuel used for energy, formed from ancient plant matter.
- 16. The study of how living things interact with each other and their environment.
- 17. Any living animal, especially one that is not human.
- 18. The power needed to do work, often from fuel, electricity, or the sun.