Along the “Ring of Fire”, there are tectonic plates along the Pacific compared to the Atlantic. These colliding plates are resting on a giant ocean of magma, the volcanoes rest on a break in the plant where the magma rises to break the surface.
The plates DO NOT rest on a “molten ocean of magma.” Subduction carries oceanic crust to depths where heat drives off water from the rocks, lowering the melting point. Blobs of magma form that rise buoyantly through the crust. If the blobs reach the surface, they make a volcano. This happens a lot in the subduction zones around the Pacific.
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