Across
- 3. a measure of the amount of carbon dioxide
- 4. when a species at risk of extinction
- 5. organisms interacting w their environment
- 8. the increase in earth's temperature
- 9. an area with a high density of trees
- 10. the natural home of an animal, plant, or other organism
Down
- 1. a very strong wind
- 2. a natural fuel from living organisms
- 6. the process of planting trees on land that has never been forested
- 7. a substance that pollutes something