Stem Crossword 18

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Across
  1. 3. Attack
  2. 7. World or universe
  3. 8. Pressure
  4. 9. Heart
  5. 11. Like
  6. 13. Stranger
  7. 14. Island
  8. 16. Seller
  9. 18. Little
  10. 19. Front
  11. 20. Trillionth
  12. 22. Vessel
  13. 23. Know
Down
  1. 1. Iron
  2. 2. Circle
  3. 4. Wood
  4. 5. Somewhat
  5. 6. Skull
  6. 7. Against
  7. 10. Bone
  8. 12. Seven
  9. 15. Vapor
  10. 17. Billionth
  11. 18. Without
  12. 21. Idea