atoll etymology

Etymology

The word "atoll" is derived from the Maldivian and Dhivehi word "atholhu", which refers to a circular or oval-shaped coral reef.

Meaning

An atoll is a ring-shaped coral reef or island that surrounds a lagoon. The reef is composed of living corals and their skeletons, while the lagoon is a sheltered area of water. Atolls typically form on top of submerged volcanic islands that have eroded over time.

Origin

Geologically speaking, atolls are formed over millions of years through a series of processes:

  1. Volcanic Activity: A volcanic eruption creates an island in the ocean.
  2. Coral Growth: Corals attach themselves to the island's coastline and begin to grow upwards and outwards.
  3. Subsidence: The volcanic island sinks due to the weight of the coral growth.
  4. Ring Formation: As the island sinks, the corals continue to grow, creating a ring-shaped reef.
  5. Lagoon Formation: The interior of the reef becomes a lagoon, which is sheltered from the open ocean.
  6. Emergence: If the rate of coral growth exceeds the rate of subsidence, the reef can rise above sea level, forming an atoll.

Atolls are common in the Indian and Pacific Oceans. They provide important habitats for marine life and serve as tourist destinations and fishing grounds.

atoll relate terms

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