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The main place to find these types of volcanoes is the "Ring of Fire" that circles the Pacific Ocean. There are more than 450 volcanoes in the Ring of Fire, according to the National Oceanic and ...
The volcanoes measure at least 3.5 miles across and rise more than 490 ... which has been crossed by all types of boats for millennia. This clearly shows how little known the seabed still is ...
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