Crack the Science Code!

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Across
  1. 2. – Two or more atoms bonded together.
  2. 4. – The amount of matter in an object.
  3. 6. – A group of cells working together.
  4. 8. – A force that resists motion between surfaces.
  5. 10. – The ability to do work.
  6. 12. – The force that pulls objects toward Earth.
  7. 13. – The smallest unit of matter.
Down
  1. 1. – The basic unit of life.
  2. 3. – A community of living things and their environment.
  3. 5. – A state of matter with a fixed shape and volume.
  4. 7. – The process of liquid changing to gas.
  5. 9. – A particle in the nucleus with no charge.
  6. 11. – The path a planet takes around the Sun.