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The when it is inside the earth, the lava is called magma. It is composed of molten rock. It originates from the melting of rock in the mantle and the crust. How the material melts depends on the geologic setting. At divergent plate boundaries the crust becomes thinner, which reduces pressure on the mantle and lowers the melting point, causing some of it to melt. At subduction zones, volatile components such as water are introduced into the mantle, which also lowers the melting point. At hot spots, material rises from the hotter lower mantle to the upper mantle, and thus experiences lower pressure. The magma then rises through the crust to erupt from volcanoes. As the magma rises it sometimes melts some of the crust. Since some of the original magma solidifies this does not increase the total amount of magma but it is important in that it alters the magma's composition and thus its behavior.

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