Matter and forces

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Across
  1. 4. it has a higher mass than a piece of paper
  2. 6. the amount of matter something contains
  3. 8. Newton created the theory of gravity
  4. 10. they are plastic, steel, paper
  5. 11. it can be found by dividing mass by volume
  6. 13. it has less mass than a watermelon
  7. 14. it comes from a plant
  8. 16. the amount of space an object occupies
  9. 17. forces do not touch the objects they act
  10. 18. it floats because it has a low density
Down
  1. 1. it measures volume
  2. 2. it can be gas solid liquid
  3. 3. it attracts objects to the centre of earth
  4. 5. they have a north and a south pole
  5. 7. poles repel each other
  6. 9. it tells the amount of matter
  7. 12. it is a contact force
  8. 15. this force exists only in liquids