ns crossword topic 15

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Across
  1. 4. star in the centre of our solar system
  2. 5. no lit part is visible to people on earth
  3. 6. large kind of seaweed that grows mostly in cold sea water
  4. 8. terrestrial planet that we live on
  5. 10. the tendency of all objects to attract any other objects
  6. 12. bulge high tide
  7. 13. of the moon shapes of the lit part of the moon as seen by an observer on earth
  8. 15. whole lit part of the moon can be seen from earth
Down
  1. 1. person who travels in space
  2. 2. zone area of a shoreline that lies between the high tide and the low tide line
  3. 3. someone who studies rocks
  4. 7. amount of matter in an object
  5. 9. predictable daily rise and fall of sea and ocean levels
  6. 11. tide tide when high tide is extra high and low tide
  7. 14. body that revolves around a planet