Matter

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Across
  1. 1. A common gas that humans breathe in. (6)
  2. 5. When a solid turns into a liquid, it ____. (6)
  3. 6. This occurs when a gas turns into a liquid. (12)
  4. 8. A state of matter with no definite shape or volume. (3)
  5. 9. Dioxide A gas that plants use to make food. (8, 7)
  6. 12. This state of matter takes the shape of its container but has a definite volume. (6)
  7. 13. The process of a liquid becoming a gas. (11)
Down
  1. 2. A solid changing directly into a gas without becoming liquid first. (11)
  2. 3. The process of a liquid turning into a solid. (8)
  3. 4. This gas is essential for fire. (6)
  4. 7. A liquid's resistance to flow. (9)
  5. 10. The smallest particle of an element. (6)
  6. 11. Water in its gas form. (6)
  7. 14. The measure of the amount of matter in an object. (4)