Across
- 2. long changes in temperature and weather
- 4. a gas made when people and animals breathe out
- 5. someone who works without getting money
- 6. energy from coal, oil, or gas
- 9. when a species disappears forever
- 10. gases that go into the air from machines
- 11. species that are in danger of disappearing
- 12. to live and not die
Down
- 1. harmful dirt in the air, water, or ground
- 3. useful things we take from nature
- 7. everything around us in nature (animals, plants, people, water)
- 8. rain that damages plants, water, and buildings