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Discover rings of coral in the vast Pacific! Atolls are circular reef systems that form around submerged volcanoes, creating lagoons of crystal-clear water surrounded by coral islands. These unique geological formations take millions of years to develop and host some of Earth's most diverse marine ecosystems.
🏝️ Fun fact: Charles Darwin was the first to correctly explain atoll formation in 1842—volcanic islands slowly sink while coral reefs keep growing upward!
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