Halloween vocabulary review

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Across
  1. 3. our galaxy
  2. 4. tissues that work together make up this
  3. 7. gas parts of the Earth
  4. 10. the largest system we know about
  5. 11. rocky parts of the Earth
  6. 12. the whole Earth including the core
Down
  1. 1. our sun plus the planets and moons
  2. 2. water parts of the Earth
  3. 5. living parts of the Earth
  4. 6. organs that work together to perform a function
  5. 8. cells that work together make up this
  6. 9. the smallest unit of life