Coastal and Oceanic Landform (12.Blowhole)

                                                                                                                                         Back to Coastal and Oceanic Landform

• A 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

Hummanaya -  in Southern Province, Sri Lanka.

Nakalele Point in north western Maui, Hawaii.