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The island, named Tofua, consists mainly of a massive ring-like caldera left by an explosive eruption millions of years ago. The caldera's steep walls stand up to 1,690 feet (515 meters ...
The island, named Tofua, consists mainly of a massive ring-like caldera left by an explosive eruption millions of years ago. The caldera's steep walls stand up to 1,690 feet (515 meters) above sea ...