Breakout

1234567891011
Across
  1. 2. An increase in the size of a substance when it is heated (thermal ---)
  2. 5. Two or more atoms bonded together
  3. 7. Anything that has mass and takes up space
  4. 9. A measure of how much matter is in an object
  5. 11. Gas that makes up 21% of Earth's atmosphere
Down
  1. 1. Atoms and molecules that make up matter
  2. 3. A decrease in the size of a substance when it is cooled (thermal ---)
  3. 4. The study of matter
  4. 6. Gas that makes up 78% of Earth's atmosphere
  5. 8. A measure of how much space an object takes up
  6. 10. The basic building block of all matter