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The Bear Seamount (left), a guyot in the northern Atlantic Ocean. In marine geology, a guyot (/ ˈ ɡ iː. oʊ, ɡ iː ˈ oʊ /), [1] [2] also called a tablemount, is an isolated underwater volcanic mountain with a flat top more than 200 m (660 ft) below the surface of the sea. [3] The diameters of these flat summits can exceed 10 km (6 mi). [3]
The Marcus-Wake Seamounts lie nearby, [3] but MIT Guyot is a more isolated volcanic edifice [2] that is sometimes considered to be a member of the Japanese Seamounts. [7] The crust beneath the seamount is 160 million years old [8] and the Kashima fracture zone passes southwest from MIT Guyot. [9]
Underneath Allison Guyot, the seafloor is about 130–119 million years old, [15] and a 128-million year-old magnetic lineation is located nearby. [30] The Molokai fracture zone forms a ridge which passes close to Allison Guyot and intersects with another ridge at the seamount. [31] Tectonically the seamount is part of the Pacific plate. [4]
A spin is more complex, involving intentionally stalling a single wing, causing the plane to descend spiraling around its yaw axis in a corkscrew motion. A hammerhead (also known as a stall turn ) is performed by pulling the aircraft up until it is pointing straight up (much like the beginning of a loop), but the pilot continues to fly straight ...
Resolution Guyot (formerly known as Huevo) is a guyot (tablemount) in the underwater Mid-Pacific Mountains in the Pacific Ocean. It is a circular flat mountain, rising 500 metres (1,600 ft) above the seafloor to a depth of about 1,320 metres (4,330 ft), with a 35-kilometre-wide (22-mile) summit platform.
Takuyo-Daisan is a guyot [6] that rises to a minimum depth of 1,409 metres (4,623 ft) [7] and is capped by an approximately square-shaped surface platform at about 1,600 metres (5,200 ft) depth [8] which has a surface area of about 86 square kilometres (33 sq mi). [7]
Horizon Guyot is a presumably Cretaceous guyot (tablemount) in the Mid-Pacific Mountains, Pacific Ocean.It is an elongated ridge, over 300 kilometres (190 mi) long and 4.3 kilometres (2.7 mi) high, that stretches in a northeast–southwest direction and has two flat tops; it rises to a minimum depth of 1,443 metres (4,730 ft).
Earlier theories by Alfred Wegener and Alexander du Toit of continental drift postulated that continents in motion "plowed" through the fixed and immovable seafloor. The idea that the seafloor itself moves and also carries the continents with it as it spreads from a central rift axis was proposed by Harold Hammond Hess from Princeton University and Robert Dietz of the U.S. Naval Electronics ...