Science Day crossword puzzle - Finals

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Across
  1. 3. Burns in room temperature
  2. 4. Even _____ can't escape the black hole's gravity
  3. 8. ______ is the densest element.
  4. 10. Uranus and Neptune have _______ rains.
  5. 12. Black Holes are so strong that they can even bend ____ itself.
  6. 14. The largest moon in our solar system
Down
  1. 1. The main element used in computer chips
  2. 2. Skin is the _______ organ in humans.
  3. 4. Gallium is a ______ Metal.
  4. 5. Balloons are filled with ______ to levitate upwards.
  5. 6. The largest bone in the human body.
  6. 7. Platinum, Iridium and silver are ___ Metals.
  7. 9. _____ is caused when an object vibrates.
  8. 11. The smallest moon in our solar system
  9. 13. The speed of sound (767MPH) is also called ____ 1.