Across
- 3. Gas layer shielding Earth from UV light
- 6. A mountain or hill having a crater through which lava and gas are erupted.
- 7. Large area densely covered with trees and wildlife -
- 10. Synthetic waste material polluting oceans
- 12. Clean energy derived from the sun
- 13. The long-term average pattern of weather in a specific region.
- 15. Processing waste to make new goods
- 16. The natural home or environment of an animal or plant.
- 18. Gas produced during photosynthesis
Down
- 1. Manure made from natural garden waste
- 2. Dry ecosystem receiving minimal rainfall
- 3. Large body of saltwater covering Earth
- 4. Remnants of plants and animals formed over millions of years
- 5. Gas used by plants during photosynthesis
- 8. A natural flowing stream of fresh water moving toward an ocean or lake.
- 9. A large natural elevation of the Earth's surface rising abruptly from the surrounding level.
- 10. Harmful contamination of the environment
- 11. Essential fluid for all living organisms
- 14. Floating mountain of ice in cold waters
- 17. What is used by air turbines to make energy?