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Sea-based blowhole Land-based blowhole. 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]
Calder's Geo, Shetland Geo of Sclaites at Duncansby Head, Caithness. A geo or gio (/ ɡ j oʊ / GYOH, from Old Norse gjá [1]) is an inlet, a gully or a narrow and deep cleft in the face of a cliff.
A blowhole is a cavity formed when a joint between a sea cave (formed by erosion) and the land surface above the cave becomes enlarged. The sea cave and the land surface become conjoined when the roof of the cave collapses.
Blowhole – Hole at the top of a sea-cave which allows waves to force water or spray out of the hole; Channel – Narrow body of water; Cape – Large headland extending into a body of water, usually the sea; Calanque – Narrow inlet on the Mediterranean coast; Cliff – Tall, near vertical rock face; Coast – Area where land meets the sea ...
A wave-cut platform, shore platform, coastal bench, or wave-cut cliff is the narrow flat area often found at the base of a sea cliff or along the shoreline of a lake, bay, or sea that was created by erosion. Wave-cut platforms are often most obvious at low tide when they become visible as huge areas of flat rock.
Blowhole (anatomy), the hole at the top of a whale's or other cetacean's head; Blowhole (geology), a hole at the inland end of a sea cave Kiama Blowhole in Kiama, Australia; The Blow Hole, a marine passage between Minstrel and East Cracroft Islands in the Central Coast of British Columbia, Canada; Blowhole Diversion Tunnel in Victoria, Australia
Delicate Arch in Arches National Park, Utah, United States The Great Arch, Tabuk Province, Saudi Arabia. A natural arch, natural bridge, or (less commonly) rock arch is a natural landform where an arch has formed with an opening underneath.
The Hālona Blowhole was formed thousands of years ago during the period of volcanic activity in Oahu, [8] with Koko Crater's lava flowing into the ocean. [9] The lava tubes extend into the ocean which are narrow at the top. [9]