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Blue Hole: distant aerial PowerPoint Presentation
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Blue Hole: distant aerial

Blue Hole: distant aerial

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Blue Hole: distant aerial

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  1. Blue Hole: distant aerial

  2. Blue Hole: map

  3. Blue Hole: closer

  4. Blue Hole: boats for scale

  5. Blue Hole: scuba diving

  6. Sink holes

  7. Sink hole: Florida

  8. Florida Winter Park sink hole

  9. Early St. Louis, showing sink holes:

  10. St. Louis sink hole: 1900

  11. St. Louis: modern sink holes

  12. Guatemala City “Sinkhole” – not actually a sinkhole

  13. Blue Hole: former stalactites

  14. Cenote:

  15. Chichen Itza: map

  16. Chichen Itza Cenote:

  17. Chichen Itza Cenote:

  18. Chichen Itza: aerial

  19. Cenote Yax Mul, Mexico

  20. Aricebo

  21. Great Barrier Reef (Australia)

  22. Great Barrier Reef (Australia)

  23. Great barrier reef (Australia)

  24. Zacaton (Mexico): http://www.laputanlogic.com/articles/2004/02/17-0001.html

  25. Zacaton (Mexico): http://www.searchanddiscovery.com/documents/2008/08025franke/images/03.htm

  26. Dean’s Blue Hole (Bahamas): http://www.venturethere.com/blogs/detail/Freediving-Deans-Blue-Hole-Vid/186

  27. Xiaozhai tiankeng http://www.speleogenesis.info/archive/publication.php?Type=publication&PubID=3289

  28. Xiaozhai tiankeng: http://www.wondermondo.com/Countries/As/China/Chongqing/Xiaozhai.htm

  29. Dashiwei tiankeng: http://www.wondermondo.com/Countries/As/China/Guangxi/Dashiwei.htm

  30. Dashiwei tiankeng: http://punjapit.wordpress.com/2011/02/08/chinathe-dashiwei-tiankeng/