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Lava is the name given to magma which has been erupted onto the earth's surface. Magma in turn forms by the partial melting of material in the upper mantle, usually caused by either the release of "volatiles" - water / gases etc into the mantle from a subducting slab of oceanic crust which acts to lower the temperature at which it will melt or by decompression melting of up welling mantle material.

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15y ago

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