Across
- 3. The robot who spends years cleaning up Earth.
- 4. Rivers, lakes, and oceans contain this resource that can become polluted.
- 6. Unwanted materials that should be reduced, reused, or recycled.
- 8. The spaceship where humans live in the movie.
- 9. The planet humans hope to return to.
Down
- 1. Another word for trash.
- 2. Anything that makes the environment dirty or unsafe.
- 5. Litter and overflowing landfills can pollute this.
- 7. The robot sent to search for signs of plant life.
- 8. This can be polluted by smoke and vehicle exhaust.