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What happens if ocean/seas meet magma?

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Magma is molten rock below the crust of the Earth. No ocean/sea will ever meet magma - as it's specifically defined as the molten rock BELOW the crust of the Earth. read more

No ocean/sea will ever meet magma - as it’s specifically defined as the molten rock BELOW the crust of the Earth. Magma which gets above the crust, is called Lava - and when the ocean meets it, the ocean boils and the magma cools. read more

The idea that there are five separate oceans is a human contrivance for the convenience of the geographers of an earlier era. In terms of any of the oceanographic disciplines there is no boundary where one ocean meets another. read more

What happens in a phreatomagmatic eruption is usually the erupting magma is directly introduced into a body of water – possibly a crater lake, meltwater from snow or ice, seawater – and the very large contrast in heat (sometimes upwards of 1100°C between water and basalt) causes an explosion of both the water and magma. read more

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