Across
- 2. a systematic study of the structure which we are doing now
- 5. a force that attracts that keeps people on earth
- 6. is a resistance what moves over another
- 7. a moon phases
- 9. a branch of science
- 11. an environment
- 12. the action of rotating on a axis
- 13. a large of matter
Down
- 1. magnets
- 3. is a planet that we live on
- 4. the study of living organisms
- 7. a body relative to mass
- 8. push suddenly
- 10. is a person who studies or an expert of knowledge