John the extraordinary guy’s crossword

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Across
  1. 2. Variable The thing that you change
  2. 4. scale What thing do you measure with?
  3. 6. The fifth planet in the Solar system
  4. 7. What do they call the bones that are millions of years ago?
  5. 9. Comes from a volcano
  6. 10. What is something called when that is pH 7
  7. 12. Formed by pressure or heat
Down
  1. 1. variable The thing that you keep the same
  2. 3. The eighth planet in the Solar system
  3. 5. John’s favorite sentence in Science
  4. 8. Are small pieces from the river
  5. 11. The first planet in the Solar system
  6. 12. An animal (Minh’s nickname)