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Definition of lava

The strict geological definition of lava is an extrusive magma, or a molten rock that has flowed onto the surface of the earth or other planetary bodies. Such rocks are usually basaltic or mafic in composition, but can form many different rock types.

The term is also used less formally for any rock that formed from a lava, again usually basaltic rocks.

In Russian the third meaning of word "lava" exists - masses of coal crushed inside of pit and ready for uplifting to surface. (Pavel Kartashov).
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