Plus revision (Units 13-16)

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Across
  1. 2. The force that makes things fall to the ground.
  2. 6. The outer layer of something.
  3. 9. To stay away.
  4. 10. You wear this when you travel in space.
  5. 11. Peaceful and quiet.
  6. 15. Very hot.
Down
  1. 1. It represents a country.
  2. 3. To turn in a circle.
  3. 4. Someone who travels in space.
  4. 5. Animals from the sea that can be eaten.
  5. 7. You wear this when you go swimming.
  6. 8. Extremely good.
  7. 12. The number 1,000,000.
  8. 13. May soon not exist.
  9. 14. The curved path through which objects in space move around a planet or star.