Across
- 1. Organism that breaks down dead matter
- 5. Uncontrolled fire in nature
- 7. Wood prepared for building
- 9. Cutting trees for wood
- 10. Large area covered with trees
- 12. Natural home of an organism
- 14. Protection of natural resources
- 16. Cutting down large areas of forest
- 17. Nonnative species that causes harm
- 18. Top layer of trees in a forest
- 19. Community of living and nonliving things
- 21. Gas trees release during photosynthesis
Down
- 2. Long-term weather patterns
- 3. Process plants use to make food
- 4. Wearing away of soil
- 6. Harmful substances in the environment
- 8. Planting trees to replace lost forests
- 11. Top layer of earth where plants grow
- 13. Variety of living organisms
- 15. Resource that can be replaced naturally
- 20. Group of similar organisms