How did they get that ring like shape? And will they vanish in many years?
In: Other
They are (mostly) atolls. What you see today is the rim of old volcanoes, generally stabilized with coral reefs. The volcano went dormant before they got too high or big, and the central crater floods.
Given that most of the islands are only a couple of meters above sea level, yes, it’s likely they’ll largely disappear in the not too distant future.
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