Atoll - Wikipedia
网页An atoll (/ ˈæt.ɒl, - ɔːl, - oʊl, əˈtɒl, - ˈtɔːl, - ˈtoʊl /) [ 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 ]: 60 Atolls are located in warm tropical or subtropical parts of …
Atoll - National Geographic Society
网页2023年10月19日 · An atoll is a ring-shaped coral reef, island, or series of islets. An atoll surrounds a body of water called a lagoon. Sometimes, atolls and lagoons protect a central island. Channels between islets connect a lagoon to the open ocean or sea. Atolls develop with underwater volcanoes, called seamounts. First, the volcano erupts, piling up lava on ...
Atoll | Definition & Facts | Britannica
网页atoll, coral reef enclosing a lagoon. Atolls consist of ribbons of reef that may not always be circular but whose broad configuration is a closed shape up to dozens of kilometres across, enclosing a lagoon that may be approximately 50 metres (160 feet) deep or more.
10 Most Captivating Atolls in the World (+Photos) - Touropia
网页2024年7月18日 · An atoll is a ring of coral that originally grew completely around the shoreline of an island, and which continued to grow upward on top of itself as the island subsided or eroded away. As reef building corals thrive only in warm waters, atolls are only found in the tropics and subtropics.
What Is An Atoll? - WorldAtlas
网页2019年4月17日 · An atoll is a type of coral reef with a coral rim that partially or completely surrounds a water body known as a lagoon. It is usually formed from a fringing reef around a volcanic island.
How a coral atoll forms - NOAA's National Ocean Service
网页When the island completely subsides beneath the water, it leaves a ring of growing coral with an open lagoon in its center, this is called an atoll. The process of atoll formation may take as long as 30 million years to occur.
Coastal And Oceanic Landforms: What Is An Atoll?
网页2017年4月25日 · An atoll is a ring-shaped coral reef or series of coral rims that encircle a lagoon either partially or wholly. Atoll and lagoons form a rim around an island that offers protection to the central island.
Geography of Atolls - Geography Realm
网页2024年2月23日 · Atolls are ring-shaped coral reefs, islands, or a series of islets that encircle a lagoon either partially or completely. The shape of atolls varies with some being elliptical or circular in shape and others having an angular shape. Atolls also vary in size.
Characteristics of atolls | Britannica
网页atoll, Coral reef enclosing a lagoon. Atolls consist of ribbons of reef that may not be circular but that are closed shapes, sometimes miles across, around a lagoon that may be 160 ft (50 m) deep or more.
Atoll - Encyclopedia.com
网页2018年5月23日 · atoll A ring-shaped organic reef that encloses or almost encloses a lagoon and which is surrounded by the open sea. The reef may be built of coral and/or calcareous algae. An atoll is built on an existing structure such as an extinct, submerged volcano.
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