Across
- 1. satellite that orbits the Earth
- 4. force that pulls object towards the Earth
- 5. largest animal on the Earth
- 7. largest organ in human body
- 9. red planet
- 10. study of stars and planets
Down
- 2. gas which is important for human to stay alive
- 3. animal that eat dead
- 6. bird that lays largest eggs
- 8. a person who invented light bulb