Скачать или смотреть What Are BLOWHOLES And How DANGEROUS Are They?

A blowhole is actually the end product of a long geological process that can take thousands of years, if not longer! At first, the hydraulic action of the waves of the ocean crashing against land causes small fractures in the surface. The constant movement of waves at the bottom of cliffs (or any solid structure at the shore) eats away at the area around the crack and renders it weak enough to create sea caves at the bottom.

Basically, the strength of a rock diminishes at two vital points; its top and its bottom. When both parts are unable to endure the pressure of the trapped air below and the constant attack of the sea, part of the rock crumbles. When the conditions are ripe, i.e., when there is a high tide or a rough storm at sea, jets of water abruptly erupt out of the newly formed hole at enormous pressures. Some of the outbursts of these water jets can shoot up as high as 30 meters (~98 feet).

#blowhole #dangerous #naturaldisaster

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References:
https://doi.org/10.1515/ijmr-1979-700101
https://citeseerx.ist.psu.edu/pdf/49b...
https://doi.org/10.1016/j.engfracmech...

Original Article Link:
https://www.scienceabc.com/nature/dec...

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