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