What happens when shells fall to the bottom of the ocean?

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  1. #dioxide
  2. #higher
  3. #ocean
  4. #shells
  5. #answer
  6. #deeper
  7. #content
  8. #escapes
  9. #everywhere
  10. #occurs
  11. #surface
  12. #process
  13. #carbon
  14. #dissolve
  15. #oceans
  16. #waters
  17. #atmosphere
  18. #excess