Unseen Flash Lights of Volcanic Blasts

Volcanoes are, literally, mountains with holes in their tops. When rock melts in the mantle of the earth, it rises toward the surface for release. It collects in a reservoir called a magma chamber, usually under a volcano. When this rock reaches the surface and erupts from the earth, along with pent-up gases, this is an eruption. The surface and slope of the volcano will swell with gas and lava before this event. The fountain of liquid rock that comes from an eruption will form a "spatter cone" around the areas that the earth is releasing lava from. This cone will direct molten lava away from the cone and down the volcano.
(from essortment.com)

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