The World as we know it

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Across
  1. 2. What season is the earth closes to the Sun in the Northern Hemisphere.
  2. 6. The more _____ an object has the more gravity it has.
  3. 7. Name for inner planets.
  4. 8. One way to reveal fossils.
  5. 11. The shape of the Moon when less of it is half lit.
  6. 14. An object spinning around another object.
  7. 16. An object spinning in is axis.
Down
  1. 1. The layer on top of a rock.
  2. 3. When the Earth is between the Sun and the Moon.
  3. 4. Means getting bigger.
  4. 5. An invisible force that pulls objects towards each other.
  5. 9. The path a planet takes around the Sun.
  6. 10. Name for outer planets.
  7. 12. When the Moon is between the Sun and the Earth.
  8. 13. What type of fossils are used to identify geologic periods?
  9. 15. What do you call rock layers?