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A long extinct oceanic volcano, when the volcano died the sea floor under it slowly dropper causing the volcano to sink beneath the ocean. As it sank a ring shaped coral reef formed around it and continued growing as the volcanic remnant and the reef on top of it continued sinking. Finally only the reef (and the islands on it) remained visible surrounding a lagoon. No sign of the volcano can be seen on the surface, but sonar scans reveal its remnant as a seamount on the seafloor.

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Q: What is an Atoll formed around?
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When was midway formed?

Midway Island, located in the Pacific Ocean, was formed around 28 million years ago. The atoll is an unincorporated territory belonging to the United States.


What are characteristics of a atoll reef?

Features of an atoll are: They thrive in warm tropical and subtropical waters. Most are found in the Pacific Ocean. They are products of the growth of topical sea organisms. They are usually round and formed around a lagoon.


When was midway island formed?

Midway Island, located in the Pacific Ocean, was formed around 28 million years ago. The atoll is an unincorporated territory belonging to the United States.


Which Island is formed of coral deposits in India?

Atoll.


What is an atolled formed from?

An atoll is formed from a coral reef and sometimes receding land or a volcanic structure.


What is a circular coral island that encloses a lagoon called?

A circular coral island that encloses a lagoon is called an atoll. Atolls are typically formed from coral reefs that grow around the rim of a submerged volcanic island.


What is an island around a lagoon?

atoll


Atolls form around?

An atoll is a ring-shaped coral reef that forms around a lagoon. Charles Darwin's theory of how atolls are formed as remnants of ocean volcanoes is generally considered fact.


How is an atolls formed?

An atoll is made by: it is a small lemon with 4 spikes on its faceRead more: How_do_you_make_an_atoll


Give you an example of an atoll?

An atoll is formed first as a reef that fringes a volcanic island. As the island sinks (after the volcanic activity has ceased and the crust has cooled, becoming denser), the reef continues to build upward, eventually ending up as a ring-shaped structure.


A ring-shaped coral reef around a lagoon?

Atoll


How is a atoll formed?

A volcanic island or underwater mountain forms via volcanic activity. This allows a surface near the water surface for corals to attach too. The corals form a ring around the volcano.