coral reef
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.

What is the best definition of atoll?

Definition of atoll : a coral island consisting of a reef surrounding a lagoon.

Where are atoll reef?

Most of the world’s atolls are in the Pacific Ocean (with concentrations in the Caroline Islands, the Coral Sea Islands, the Marshall Islands, the Tuamotu Islands, Kiribati, Tokelau, and Tuvalu) and the Indian Ocean (the Chagos Archipelago, Lakshadweep, the atolls of the Maldives, and the Outer Islands of Seychelles).

What is atoll with example?

The definition of an atoll is a ring shaped coral reef, or close coral islands that enclose or almost enclose a lagoon. The Bikini in the Pacific Ocean is an example of an atoll.

What is the difference between atoll and island?

is that atoll is a type of island consisting of a ribbon reef that nearly or entirely surrounds a lagoon and supports, in most cases, one to many islets on the reef platform atolls have a unique geology, so not all islands with a reef and a lagoon are atolls while island is a contiguous area of land, smaller than a …

What are atolls in geography class 9?

Atoll which is also called as coral atoll is a ring shaped reef including rim which is present around a lagoon. These can be either circular or horse shoe shaped. Most of the world’s atolls are located in Pacific Ocean.

How is a atoll formed?

The formation of an atoll is a slow process that can take millions of years. It begins when an underwater volcano erupts, creating a buildup of lava on the seafloor. With continued eruptions, the lava continues to build until it breaks through the ocean’s surface and forms an island.

How deep is an atoll?

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.

What are atolls answer?

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 beaches and coral reefs.

What are atolls for Class 6?

An atoll is a coral reef island shaped like a doughnut. The coral surrounds a lagoon. A lagoon is an area of shallow sea that is separated from the open ocean by a reef. Atolls can be made up of several small islands, which are called islets, and they may also have a larger central island.

What is the difference between an island and an atoll?

is that atoll is a type of island consisting of a ribbon reef that nearly or entirely surrounds a lagoon and supports, in most cases, one to many islets on the reef platform atolls have a unique geology, so not all islands with a reef and a lagoon are atolls while island is a contiguous area of land, smaller than a continent, totally surrounded by

What is the habitat of a coral reef?

Coral Reef habitat. Coral Reefs, which are the world’s richest marine habitats, occur in shallow, warm waters where the sea temperature is almost always between 18 to 30 degrees centigrade.

What is description of coral reefs?

Types, Functions, and Conservation of Coral Reefs. Coral reefs are physical formations primarily comprised of corals which are small invertebrate marine animals. An individual coral, also called a polyp, is cylindrically shaped with an exoskeleton. The exoskeletons give each polyp a hard rock-like outer body and a sac-like inner body.