Across
- 3. Large mass of ice that moves slowly over land (7)
- 5. The layer of gases surrounding Earth (10)
- 6. Build-up of toxins in organisms over time (15)
- 7. Geological period associated with dinosaur fossils (8)
- 8. gases trap heat in the atmosphere (9)
- 13. Material that can be broken down naturally by microorganisms (13)
- 15. Suspended particles in the atmosphere (7)
- 16. Relating to the study of organisms and their environment (10)
- 18. Large brown seaweed that forms underwater forests (4)
- 19. Substance added to soil to promote plant growth (10)
- 21. Process of capturing and storing atmospheric CO2 (20)
- 23. Non-renewable energy sources like coal, oil, gas (11)
- 24. Potent greenhouse gas released from livestock and landfills (7)
- 25. Natural environment where a species lives (7)
Down
- 1. Site for disposal of waste materials (8)
- 2. Process by which fertile land becomes desert (14)
- 4. Earth's rigid outer layer including crust and upper mantle (11)
- 9. Waste disposal method involving burning (12)
- 10. Relating to the study of water movement and distribution (11)
- 11. Protection and preservation of natural resources (11)
- 12. Artificial application of water to land for agriculture (10)
- 14. Clearing of forests for agriculture or development (12)
- 17. Salt-tolerant tree that grows along tropical coastlines (8)
- 20. High-speed air current in the upper atmosphere (10)
- 22. Community of living organisms interacting with their environment (9)