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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 and seas where ...
There are two types of lagoons, coastal and oceanic/atoll lagoons. [19] A coastal lagoon is, as the definition above, simply a body of water that is separated from the ocean by a barrier. An atoll lagoon is a circular coral reef or several coral islands that surround a lagoon. Atoll lagoons are often much deeper than coastal lagoons. [20]
The umbrella term Pacific Islands has taken on several meanings. [1] Sometimes it is used to refer only to the islands defined as lying within Oceania. [2] [3] [4] At other times, it is used to refer to the islands of the Pacific Ocean that were previously colonized by the British, French, Spaniards, Portuguese, Dutch, or Japanese, or by the United States.
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 Hawaiian Islands, a major archipelago in the Pacific Ocean. An island or isle is a piece of land, distinct from a continent, completely surrounded by water. There are continental islands, which were formed by being split from a continent by plate tectonics, and oceanic islands, which have never been part of a continent.
Johnston Atoll: Unincorporated territory of the United States: English: Johnston Atoll [31] None: Uninhabited [31] 276.6 km 2 (106.8 sq mi) Juan Fernández Islands: Special territory of Chile [36] Spanish: Archipiélago Juan Fernández: San Juan Bautista: 900 99.06 km 2 (38.25 sq mi) Kingman Reef: Unincorporated territory of the United States ...
Raised coral atoll This page was last edited on 30 November 2020, at 02:37 (UTC). Text is available under the Creative Commons Attribution ...
A prevalent characteristic found on the fore reef involves the creation of spur-and-groove formations, facilitating the downslope transportation of sediment within the groove. The upper segment of this slope is known as the reef crest.