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1) Residual heat of formation. The extreme thermal energy that is found within the core of the earth is due in part to the way the planet formed. The early earth was completely molten when protoplanetary materials were super heated as they aggregated. And the heat of formation was added to by the impact of lots of large objects, which added lots of heat energy. Some of that heat energy remains in the core. 2) Radioactive decay. Radioactive elements were carried to the core of the earth with iron when the earth differentiated early in its history. These elements are decaying and releasing heat as they do so. This heat keeps the iron core molten and is responsible for providing the energy to melt the rocks and form volcanoes.

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How can metamorphic rock be changed to igneous rock?

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Molten liquid rock inside Earth's mantle is called


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