What is ring shaped islands?

A ring-shaped island is most commonly known as an atoll. These fascinating landforms are coral reefs that have developed in a ring around a subsiding volcanic island. Here's a breakdown:

• Formation: Atolls begin as fringing reefs around a volcanic island. As the volcano slowly sinks into the ocean (island%20subsidence), the coral continues to grow upwards, keeping pace with the sinking.

• Lagoon: Eventually, the volcanic island completely disappears beneath the surface, leaving behind a ring of coral reef enclosing a central body of water called a lagoon.

• Coral Growth: The continuous growth of coral%20reefs is essential for atoll formation. Different species and growth rates impact the structure and biodiversity of the atoll.

• Islets/Motu: Over time, sand and debris accumulate on parts of the reef due to wave action and currents, creating small islands or islets, often called motu, along the atoll rim. These are typically vegetated and can support human populations.

• Passages/Channels: Gaps or channels (tidal%20channels) in the reef ring allow for water exchange between the lagoon and the open ocean, crucial for maintaining water quality and supporting marine life.

• Location: Atolls are predominantly found in the warm, tropical waters of the Pacific%20Ocean and Indian%20Ocean.