Across
- 3. to damage something
- 7. the earth has seven of these
- 8. they make up almost everything
- 9. becomes different over time
- 10. when two things or more come together
- 11. a group of humans or animals all live in the same area
- 12. dioxide we breathe this out
- 13. it is the process where plants need the energy from the sun to change carbon dioxide
Down
- 1. something that helps us understand things better
- 2. to move things around
- 4. a small thing that shows what the main thing is like
- 5. when Earth shifts over time
- 6. stays the same for a long time
- 9. has something to do when photosynthesis is happening