Atolls
A coral atoll.
An atoll is a ring-shaped coral island or string of islands that surround a lagoon. Atolls typically form from volcanic islands that sink into the ocean, leaving a coral reef formation around the edge of the submerged island. The lagoon in the center of an atoll is often shallow and can support diverse marine life.
The Marshall Islands are made up of 34 islands. Specifically, they consist of 29 coral atolls (which encircle a lagoon) and 5 coral islands (without a lagoon).
A body of water that is encircled by a coral reef is called a lagoon. A lagoon is usually shallow and is separated from the ocean by coral reefs, barrier islands, or sandbars.
A grouping of coral islands is called an atoll. Atolls are formed from coral reefs that have grown on the remnants of volcanic islands that have sunk in the ocean. They usually form a ring shape with a lagoon in the center.
a group of small coral islands in the shape of a ring that encloses a lagoon
An island made up of coral surrounding a lagoon APEX
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.
Atolls are low-lying coral islands that are formed from coral reefs growing around the rim of an ancient volcanic island that has sunk below sea level. They are characterized by a central lagoon surrounded by a ring of coral reef and sandbars.
Islands are created by the movement of continents (which floods the surrounding areas) or by volcanoes that grow from the sea floor. Coral islands have a coral ring around the eroded volcanic rock in the center.
The three types of Pacific Islands are high islands, low islands, and atolls. High islands are formed by volcanic activity and have lush vegetation, while low islands are made of coral or sand and are flat with little vegetation. Atolls are ring-shaped coral reefs that surround a lagoon.
a lake and some coral?