Blowhole (geology)
Hole at the top of a sea-cave which allows waves to force water or spray out of the hole / From Wikipedia, the free encyclopedia
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In geology, a blowhole or marine geyser is formed as sea caves grow landward and upward into vertical shafts and expose themselves toward the surface, which can result in hydraulic compression of seawater that is released through a port from the top of the blowhole.[1] The geometry of the cave and blowhole along with tide levels and swell conditions determine the height of the spray.[2][3]