Atoll - John Seach

Atolls are formed in tropical volcanic zones. A ring of coral reef encloses a
central lagoon in an atoll.

The photo above shows an atoll in the Reef Islands, Solomon Islands. This atoll is one of the world's oldest.
Tinakula volcano lies 23 miles away in this volcanically and tectonically active region.
 

Atoll
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Copyright John Seach