Across
- 3. this keeps the moon in orbit around the Earth
- 5. an imaginary line that we use to understand rotation
- 8. the moon is 4.5 _________________yrs. old
- 9. the moon is Earth's only natural _____________
- 12. the side of the moon that we cannot see from Earth
- 13. the moon has no air, very little _____________
- 15. at the center of the moon is a 700km wide _________
- 16. continuous trip around a larger object
Down
- 1. we base our _____________on the moon's orbit
- 2. the moon is 240,000 __________ away
- 4. these once erupted on the moon with lava flows
- 6. these crash into the moons surface regularly
- 7. to turn continuously around on an axis,spin
- 10. a large bowl shaped cavity on the surface
- 11. action of an object forced to hit another object
- 14. the low lands or dark spots we see on the moon