Lava is the molten rock that is expelled from volcanoes, as opposed to magma, which is what lava is called when it’s still inside the Earth. The molten rock is formed on the interior of the Earth. Its been hot enough to be molten since the formation of the Earth, and varies between solid and liquid depending on the pressures that the outside of the Earth, including the crust, places on it.
Lava is the flow of magma in the surface of the earth. Magma is a mixture of liquid rock, crystals and dissolved gas from under the earths surface. Read the link for more information.
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