Across
- 4. not man made
- 5. a struggle between organisms
- 8. using resources faster than they can regrow
- 11. nature is not making more
- 12. something people use
- 14. organisms move to find resources
- 15. our impact on Earth's resources
Down
- 1. can regrow
- 2. the number of organisms
- 3. coal, oil, gas for energy
- 6. harvesting resources that keeps them available
- 7. unlimited supply
- 9. barter for what you need
- 10. valuable for enjoyment
- 13. valuable for nature