The Moon

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Across
  1. 4. interplanetary chunks of stone that have crashed into a planet or moon from space
  2. 6. the Moon was formed at the same time as the Earth
  3. 8. seas, lunar lowlands that resemble seas as viewed from Earth
  4. 10. a gravitational force that varies in strength and/or direction
  5. 13. the Moon formed from material spun off from the Earth
Down
  1. 1. the moon is made up of Solar System debris captured by Earth
  2. 2. the friction that results from tides on a rotating object
  3. 3. exceptionally high and low tides that occur at the time of the new or full moon
  4. 5. the Moon formed as the result of an impact between a large object and the Earth
  5. 7. the conical shifting of the axis of a rotating object
  6. 9. the tides that occur when the difference between high and low tides is least
  7. 11. closest distance from the Earth
  8. 12. farthest distance from the Earth