Coastal and Oceanic Landform (12.Blowhole)



                                                                                                                                         Back to Coastal and Oceanic Landform





  • blowhole is formed as sea caves grow landwards and upwards into vertical shafts and expose themselves towards the surface.
  • It can result in blasts of water from the top of the blowhole  the cave and blowhole and state of the weather are appropriate.
  • A blowhole is called air is blown through a small hole at the surface due to pressure differences between a closed underground system & the surface.
  •  The blowholes of Wupatki National Monument are an example of such a phenomenon.
  •  It is estimated that the closed underground passages have a volume of at least 7 billion cubic feet. 
  • Wind speeds can approach 30 miles per hour.
Examples;

Alofaaga Blowholes on Savai'i Island in Samoa
Alofaaga Blowholes on Savai'i Island in Samoa

Hummanaya -  in Southern Province, Sri Lanka.
Hummanaya -  in Southern Province, Sri Lanka.















Nakalele Point in north western Maui, Hawaii.
Nakalele Point in north western Maui, Hawaii.





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