Science of WW2

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Across
  1. 3. Symbol H, on the periodic table.
  2. 4. A force that holds things to the Earth.
  3. 5. Used in rockets and explosives to make the reaction burn faster and hotter.
  4. 7. A word used to describe things that explode.
  5. 9. Word meaning, "radio detection and ranging".
  6. 10. Symbol O on the periodic table.
Down
  1. 1. A force that gives a rocket lift.
  2. 2. A medicine that was mass produced during the war.
  3. 6. Country that researched rockets for war.
  4. 8. Name of the first successful ballistic missile.