Across
- 4. made April 22 the official Earth Day
- 5. scientist who studies how living things live together in nature
- 6. to turn old things into new things instead of throwing them away
- 8. made to be thrown away
- 11. everything surrounding a living thing
Down
- 1. to use less of something
- 2. had the idea for Earth Day
- 3. to use something again
- 7. an organization that creates laws to protect the air and water
- 9. harmful things in the environment
- 10. April 22