Across
- 2. / energy from the sun
- 4. / a solid naturally occurring substance
- 7. / a species of which a very few are left
- 9. / harmful or poisonous effect in the environment
- 13. / mechanism to generate wind power
- 14. / natural resource that can be used again and again
Down
- 1. / protect something from harm or destruction.
- 3. / an activity to take out precious minerals and metals
- 5. / the upper layer of earth in which plants grow
- 6. / materials useful to humans
- 8. / to destroy the environment
- 10. / energy from tides
- 11. / a mineral that helps generate energy
- 12. / energy from power