Science Crossword puzzle

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Across
  1. 2. When an object is spinning around another object on it's axis.
  2. 7. None of the moon's reflected light is visible.
  3. 10. When the moon is in between the Earth and the sun.
  4. 13. Mostly out of iron.
  5. 14. When the Earth is in between the moon and the sun.
  6. 15. One cycle occurs over one year.
  7. 16. Rock layers get tilted, folded, or even broken.
Down
  1. 1. As new layers form on top, they cover and preserve older layers.
  2. 3. Gas and Ice planets with many moons.
  3. 4. Seasons happen from the tilt of Earth on it's axis.
  4. 5. When an object is spinning on its axis.
  5. 6. The weakest force in the universe.
  6. 8. The Latin word "dug up".
  7. 9. Remains or impressions of ancient organisms preserved in rock.
  8. 11. Issac Newton found this type of force.
  9. 12. Half of the moon always appears lit because it reflects light from the sun.