Smart Stuff & Little Facts

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Across
  1. 2. Tiny infectious agent
  2. 5. Brain cell for thinking
  3. 6. Stores electrical energy
  4. 7. Radiation used in hospitals
  5. 12. Detects objects with waves
  6. 15. Essential for breathing
  7. 17. Force keeping us grounded
  8. 18. Gas that makes balloons float
  9. 19. Attracts iron objects
Down
  1. 1. Sun’s power source
  2. 3. Base of all known life
  3. 4. Common crystal in watches
  4. 5. Most abundant air gas
  5. 8. Metal mix like bronze
  6. 9. Path for electric current
  7. 10. Digital image unit
  8. 11. Splits white light
  9. 13. Smallest unit of matter
  10. 14. Light focused into a beam
  11. 16. Sound bouncing back