Across
- 6. Gas layer that shields Earth from UV
- 7. Illegal hunting of animals
- 9. Planting trees to restore forests
- 10. Expansion of cities into natural areas
- 12. Atmospheric layer containing ozone
- 15. Large scale removal of trees
- 16. Polluted foggy air in cities
- 18. Land saturated with water
- 19. Place where trash is buried
- 20. Chemical used to kill pests
Down
- 1. Natural home of an organism
- 2. Group of organisms sharing common traits
- 3. Plants making food using light
- 4. Rain containing harmful pollutants
- 5. Decomposed organic matter for soil
- 8. Slow moving river of ice
- 11. Variety of life in an ecosystem
- 13. Turn waste into new products
- 14. Community of organisms and their environment
- 17. Wearing away of rock and soil