History of the World (1/3)

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Across
  1. 3. the nickname that the movie gives STARS for producing elements
  2. 5. One of the two elements (the other being Hydrogen) needed to create STARS
  3. 6. The thing credited with introducing oxygen to our planet
  4. 7. the Worst extinction event in the planet's history
Down
  1. 1. Element used by the universe to make everything around us
  2. 2. The third planet from the sun
  3. 4. the "kind of explosion" that the film describes as "Biology's version of the Big Bang"