Science project (cuz´ somehow it´s required)

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Across
  1. 2. chain of rocks
  2. 3. saturn
  3. 5. pluto
  4. 7. a planet´s way of acting Darth Vader
  5. 9. opposite of a multiverse
Down
  1. 1. the ___________ of acid is SH2O4
  2. 4. 8 planets, 1 dwarf planet
  3. 6. rock shell
  4. 8. air shell