Stuff we have learned from each other

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Across
  1. 5. A leaf-shaped creature.
  2. 6. The number of these determines the atomic number of an element.
  3. 8. This metal is used to make Zeppelins.
  4. 9. The watertight walls in a ship are called...
  5. 11. The process of a species slowly changing over time.
Down
  1. 1. Chinese food is a type of...
  2. 2. This river is 6,695 km long.
  3. 3. This animal competed with the Dire Wolf for food.
  4. 4. A type of ballroom dance.
  5. 6. According to Billie, our environment is...
  6. 7. It is 650 light years away.
  7. 10. A common type of air pollution.