General knowledge

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Across
  1. 2. What name is given to the natural phenomenon by which physical bodies attract each other with a force proportional to their masses?
  2. 8. Which part of the eye determines its colour?
  3. 10. What gas propels a champagne cork from a bottle?
  4. 11. Stephen Hawking once said that "If the universe had existed forever, then everything would be the same ...".
  5. 13. What is Bohrium used for?
Down
  1. 1. What was the surname of the German scientist who invented the mercury thermometer in 1714?
  2. 3. Which element combines with sodium to make common salt?
  3. 4. In physics, what is the name given to the type of energy that an object possesses due to its motion?
  4. 5. What is the most common element found in our universe?
  5. 6. Ozone is made up of atoms of which gas?
  6. 7. What kind of animal is a Bombay Duck?
  7. 9. What is the pH number of a substance that is neither acid nor alkali?
  8. 10. What bone is statistically the most broken bone in the human body?
  9. 12. In physics, what is the more common term for the 'Einstein-Rosen Bridge'?