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Lava is made up of crystals, volcanic glass, and bubbles (volcanic gases). As magma gets closer to the surface and cools, it begins to crystallize minerals like olivine and form bubbles of volcanic gases. When lava erupts it is made up of a slush of crystals, liquid, and bubbles.
Sorry, something has gone wrong. Trending Now. Answers. Best Answer: There is a kind of rock called pumice, made from cooled lava, that has a porosity of up to 90% (that is to say, for a pumice rock of a given volume, only about 10% of that volume actually contains rock and the rest is air).