The atoll of Tetiʻaroa in French Polynesia 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 …

Atoll, coral reef enclosing a lagoon.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 …

Mar 19, 2025 · 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 …

May 10, 2025 · What is an Atoll and what makes them unique: ring-shaped coral reefs surrounding lagoons formed where volcanic islands once stood.

ATOLL definition: 1. a ring-shaped island formed of coral (= rock-like natural substance) that surrounds a lagoon…. Learn more.

Apr 17, 2019 · An atoll is a type of coral reef with a coral rim that partially or completely surrounds a water body known as a lagoon.

How a coral atoll forms This animation shows the dynamic process of how a coral atoll forms. Corals (represented in tan and purple) begin to settle and grow around an oceanic island …

ATOLL definition: a ring-shaped coral reef or a string of closely spaced small coral islands, enclosing or nearly enclosing a shallow lagoon. See examples of atoll used in a sentence.

An atoll is an island formed by a ring-shaped coral reef encircling a lagoon. The word comes from the language of the Maldives, an island chain in the Indian Ocean famous for gorgeous …

( Khaled bin Sultan Living Oceans Foundation) An atoll is a ring-shaped coral reef that forms as an old volcano erodes. This video delves into how this process plays out over geologic time.