Radon Gas

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 6. Vulnerability to the elements (8)
  2. 8. Extremely poisonous or injurious (6)
  3. 11. A heavy toxic silvery-white radioactive metallic element (7)
  4. 12. Impossible or nearly impossible to see (9)
  5. 13. Carcinoma of the ___ (10)
  6. 14. A mechanical system in a building that provides fresh air (11)
  7. 15. A position on a scale of intensity or amount or quality (5)

Down

  1. 1. The act of subjecting to experimental test in order to determine how well something works (7)
  2. 2. The 2nd letter of the Greek alphabet (4)
  3. 3. An independent federal agency established to coordinate programs aimed at reducing pollution (3)
  4. 4. Someone regarded as certain to succeed (7)
  5. 5. The 1st letter of the Greek ___ (5)
  6. 7. Any process in which electrons are added to an atom or ion (9)
  7. 9. Exhibiting or caused by ___ (11)
  8. 10. The act of observing something (10)
  9. 16. Posing no difficulty (4)