When coal is burned to produce electricity, the electrical energy produced is less than the potential energy of the coal. Which best explains this observation?

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

the answer should be in the picture.