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Canton Island typifies the isolated coral atolls dotting the Pacific Ocean. The Structure and Distribution of Coral Reefs, Being the first part of the geology of the voyage of the Beagle, under the command of Capt. Fitzroy, R.N. during the years 1832 to 1836, was published in 1842 as Charles Darwin's first monograph, and set out his theory of the formation of coral reefs and atolls.
The atoll of Tetiʻaroa in French Polynesia. An atoll (/ ˈ æ t. ɒ l,-ɔː l,-oʊ l, ə ˈ t ɒ l,-ˈ t ɔː l,-ˈ t oʊ l /) [1] is a ring-shaped island, including a coral rim that encircles a lagoon. There may be coral islands or cays on the rim. [2] [3] Atolls are located in warm tropical or subtropical parts of the oceans
The reef lies in Mexican waters 35 kilometres (22 mi) offshore in the Caribbean Sea, or about 80 kilometres (50 mi) east of the city of Chetumal. It is approximately 40.2 kilometres (25.0 mi) long from north to south, and approximately 16 kilometres (9.9 mi) wide at its widest point. It covers an area of 800 square kilometres (310 sq mi).
Scott Reef North consists of a large, approximately circular-shaped, reef lying 23 km (14 mi) southwest of Seringapatam Reef. The reef is composed of a narrow reef-crest that is backed by broad reef flats – much of which becomes exposed at low tide – and a deep central lagoon that is connected to the open sea by two delta-like channels.
As the subsidence continues, the fringing reef becomes a barrier reef and ultimately an atoll reef. Darwin's theory starts with a volcanic island which becomes extinct As the island and ocean floor subside, coral growth builds a fringing reef , often including a shallow lagoon between the land and the main reef.
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 ...
Lighthouse Reef is an atoll in the Caribbean Sea, the easternmost part of the Belize Barrier Reef and one of its three atolls, the other two being Turneffe Atoll and Glover's Reef. Lighthouse Reef is located about 80 kilometres (50 mi) southeast of Belize City .
Beveridge Reef seen from space The Beveridge Reef is a coral atoll that is approximately 147 miles (237 km) from Niue and 520 miles (840 km) from the Cook Islands. [ 1 ] [ 2 ] [ 3 ] The reef is normally submerged, [ 4 ] with a small part visible at low tide .