SCIENCE UNPLUGGED

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Across
  1. 7. Lightest chemical element
  2. 8. Common mineral in rocks
  3. 10. Sun's energy source
  4. 12. Brain cell that transmits signals
  5. 14. Plates that cause earthquakes
Down
  1. 1. Closed electrical path
  2. 2. Earth's pulling power
  3. 3. Particle of light
  4. 4. Organism's complete DNA
  5. 5. Protective atmospheric layer
  6. 6. Tiny agent causing illness
  7. 9. Push or pull in physics
  8. 11. DNA's basic unit
  9. 13. Smallest unit of matter