science cross word

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Across
  1. 4. the force that attracts a body towards the centre of something
  2. 5. easy to confuse with weight
  3. 9. the amount or degree of cold or heat
  4. 13. a large, round object in space that moves around the sun or another star
  5. 14. the star of our Solar system
  6. 15. is the physical substances that exist in the universe.
  7. 16. the smallest particle of an element
  8. 18. the ability to do a work
  9. 19. the changement from solid to liquid
Down
  1. 1. you can find it as "Ti" in the periodic table
  2. 2. the planet that we live on
  3. 3. it emit light by it self
  4. 4. a substance in a form that is like air and not solid or liquid
  5. 6. is a fluid matter
  6. 7. easy to confuse with mass
  7. 8. the gas inside the ballons
  8. 10. one of several very small planets that move around the sun
  9. 11. a simple substance that you cannot reduce to smaller chemical parts
  10. 12. the gases around the earth
  11. 17. a unit for measuring energy