Science Crossword Challenge (get it right, win a prize!)

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Across
  1. 3. American, Industrial or one year
  2. 6. Rocks with fossils
  3. 7. Biggest planet, greatest god
  4. 9. Ours is "milky"
  5. 15. Diamond, for example; or talc
  6. 16. The end of a species
  7. 17. Wall of water made by earthquakes
  8. 18. Transformed by heat and pressure
  9. 20. Mars has two, Venus none
  10. 21. Roman god of war
  11. 22. Rocks made of magma
Down
  1. 1. Rocky, warm, small
  2. 2. Planets of many moons, rings, gas
  3. 4. Study of how Earth's plates move
  4. 5. The "happy" part of an atom
  5. 8. Bad stuff on land, air and sea
  6. 10. Symbol of Mott Hall
  7. 11. The study of objects beyond Earth
  8. 12. The longest day
  9. 13. Gases that keep Earth warm, like CO2
  10. 14. Outer rock belt
  11. 19. Spinning in astronomy