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The rock core, retrieved from a staggering depth of 1,268 meters (4,160 feet) below the seabed, was collected from the Mid-Atlantic Ridge, a tectonic boundary where the Eurasian Plate meets the No ...
These zones include: the Pacific Ring of Fire around the Pacific Ocean the Mid-Atlantic Ridge ... than 3,200 kilometres from the nearest plate boundary. This is explained by the 'hotspot' theory.