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Enlargeable, detailed map of Midway Atoll. Midway Atoll is part of a chain of volcanic islands, atolls, and seamounts extending from the Island of Hawaii up to the tip of the Aleutian Islands and known as the Hawaiian–Emperor seamount chain, between Pearl and Hermes Atoll and Kure Atoll in the Northwestern Hawaiian Islands.
Over geologic time, the volcanic island becomes extinct and eroded as it subsides completely beneath the surface of the ocean. As the volcanic island subsides, the coral fringing reef becomes a barrier reef that is detached from the island. Eventually, reef and the small coral islets on top of it are all that is left of the original island, and ...
The Hawaiian–Emperor seamount chain is a mostly undersea mountain range in the Pacific Ocean that reaches above sea level in Hawaii.It is composed of the Hawaiian ridge, consisting of the islands of the Hawaiian chain northwest to Kure Atoll, and the Emperor Seamounts: together they form a vast underwater mountain region of islands and intervening seamounts, atolls, shallows, banks and reefs ...
Hawaiʻi island (the Big Island) is the biggest and youngest island in the chain, built from five volcanoes. Mauna Loa, taking up over half of the Big Island, is the largest shield volcano on the Earth. The measurement from sea level to summit is more than 2.5 miles (4 km), from sea level to sea floor about 3.1 miles (5 km). [16]
At that point, erosion of the volcano and subsidence of the seafloor cause the volcano to gradually diminish. As the volcano sinks and erodes, it first becomes an atoll island and then an atoll. Further subsidence causes the volcano to sink below the sea surface, becoming a seamount.
Kure Atoll (/ ˈ k ʊər iː /; Hawaiian: Hōlanikū, lit. 'bringing forth heaven'; Mokupāpapa, 'flat island') [1] or Ocean Island is an atoll in the Pacific Ocean 48 nautical miles (89 km; 55 mi) west-northwest of Midway Atoll in the Northwestern Hawaiian Islands at . A coral ring 6 miles (9.7 km) across encloses a lagoon several meters deep.
Johnston Atoll is located between the Marshall Islands and the Hawaiian Islands. Johnston Atoll is a 1,300-hectare (3,200-acre) atoll in the North Pacific Ocean, located about 750 nautical miles (1,390 km; 860 mi) southwest of the island of Hawaiʻi, and is grouped as one of the United States Minor Outlying Islands. [11]
Gahaafaru Atoll also known as Gaafaru Atoll or Gaafarufalhu is a small atoll at the eastern end of a large elliptical reef that has proved disastrous to many vessels with the wrecks of Aracan (1873), SS Seagull (1879), Clan Alpine (1879), Erlangen (1894), Crusader (1905) and Lady Cristine (1974). 15 kilometres (9.3 miles) long and 8.5 ...