📖 what
What is an atoll?
GeographyCoral reefs
Quick Answer
An atoll is a ring-shaped coral island or reef that surrounds a lagoon. It usually forms after a volcanic island sinks or erodes away.
The Full Story
Atolls were famously explained by Charles Darwin after his voyage on the HMS Beagle in the 1830s. He proposed that coral reefs can grow upward around a subsiding volcanic island, eventually leaving a ring of coral and a central lagoon. Modern geology supports this general idea, though details vary by location. Atolls are common in tropical oceans and are especially important in places like the Maldives and parts of the central Pacific.
Key Facts
1.Ring-shaped reef or island surrounding a lagoon
2.Linked to Darwin’s 1830s reef theory
3.Common in tropical oceans
YouTube Angle
Suggested video title for this topic:
"How a sinking volcano becomes a coral ring"