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- Blue_hole abstract "For other uses and a list of blue holes, see Blue hole (disambiguation).A blue hole is a cave (inland) or underwater sinkhole. They are also called vertical caves. There are many different blue holes located around the world, typically in low-lying coastal regions. The best known examples can be found in Belize, the Bahamas, Guam, Australia (in the Great Barrier Reef), and Egypt (in the Red Sea).Blue holes are roughly circular, steep-walled depressions, and so named for the dramatic contrast between the dark blue, deep waters of their depths and the lighter blue of the shallows around them. Their water circulation is poor, and they are commonly anoxic below a certain depth; this environment is unfavorable for most sea life, but nonetheless can support large numbers of bacteria. The deep blue color is caused by the high transparency of water and bright white carbonate sand. Blue light is the most enduring part of the spectrum; other parts of the spectrum—red, yellow, and finally green—are absorbed during their path through water, blue light manages to reach the white sand and return upon reflection.The deepest blue hole in the world-at 392 meters (1,286ft) is Pozzo del Merro in Italy. The deepest blue hole in the world with underwater entrance—at 202 metres (663 ft)—is Dean's Blue Hole, located in a bay west of Clarence Town on Long Island, Bahamas. Other blue holes are about half that depth at around 100–120 metres (330–390 ft). The diameter of the top entrance ranges typically from 25–35 metres (82–115 ft) (Dean's Blue Hole) to 300 metres (980 ft) (Great Blue Hole in Belize).".
- Blue_hole thumbnail Great_Blue_Hole.jpg?width=300.
- Blue_hole wikiPageExternalLink blueholes.html.
- Blue_hole wikiPageExternalLink blue-hole-natural-monument.html.
- Blue_hole wikiPageExternalLink www.blueholes.org.
- Blue_hole wikiPageExternalLink 12th%20Inappropriate%20name.pdf.
- Blue_hole wikiPageExternalLink mysteriuos-cave-systems-in-bahamas.
- Blue_hole wikiPageExternalLink extreme-cave-diving.html.
- Blue_hole wikiPageExternalLink BahamaIntro.html.
- Blue_hole wikiPageID "4327672".
- Blue_hole wikiPageRevisionID "603275513".
- Blue_hole hasPhotoCollection Blue_hole.
- Blue_hole subject Category:Cave_geology.
- Blue_hole subject Category:Marine_geology.
- Blue_hole subject Category:Sea_caves.
- Blue_hole subject Category:Sinkholes.
- Blue_hole subject Category:Underwater_diving_sites.
- Blue_hole type Cave109238926.
- Blue_hole type GeologicalFormation109287968.
- Blue_hole type NaturalDepression109366017.
- Blue_hole type Object100002684.
- Blue_hole type PhysicalEntity100001930.
- Blue_hole type SeaCaves.
- Blue_hole type Sinkhole109435739.
- Blue_hole type Sinkholes.
- Blue_hole type YagoGeoEntity.
- Blue_hole type YagoPermanentlyLocatedEntity.
- Blue_hole comment "For other uses and a list of blue holes, see Blue hole (disambiguation).A blue hole is a cave (inland) or underwater sinkhole. They are also called vertical caves. There are many different blue holes located around the world, typically in low-lying coastal regions.".
- Blue_hole label "Agujero azul".
- Blue_hole label "Blue hole".
- Blue_hole label "Buraco azul".
- Blue_hole label "Dolina marina".
- Blue_hole label "Trou bleu (géologie)".
- Blue_hole label "Голубая дыра".
- Blue_hole label "ブルーホール".
- Blue_hole label "蓝洞".
- Blue_hole sameAs Agujero_azul.
- Blue_hole sameAs Trou_bleu_(géologie).
- Blue_hole sameAs Lubang_biru.
- Blue_hole sameAs Dolina_marina.
- Blue_hole sameAs ブルーホール.
- Blue_hole sameAs 블루홀.
- Blue_hole sameAs Buraco_azul.
- Blue_hole sameAs m.0bxbpl.
- Blue_hole sameAs Q7180402.
- Blue_hole sameAs Q7180402.
- Blue_hole sameAs Blue_hole.
- Blue_hole wasDerivedFrom Blue_hole?oldid=603275513.
- Blue_hole depiction Great_Blue_Hole.jpg.
- Blue_hole isPrimaryTopicOf Blue_hole.
