Matter

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Across
  1. 2. this happens when a solid turns into a liquid
  2. 7. the amount of matter in an object
  3. 10. this is one of the smallest things known to science
  4. 12. this happens when a liquid turns into a gas
  5. 13. water in a solid form
  6. 14. this gas is used in balloons to make them float
Down
  1. 1. this is the fourth state of matter
  2. 3. if an object floats or sinks
  3. 4. the molecules are spread apart
  4. 5. this is important element
  5. 6. this happens when a liquid is heated
  6. 8. this is a state of matter that is hard
  7. 9. this happens to water when it is 0 or colder
  8. 11. the amount of space an object takes up