energy formed by magma heating earth's crust is emitted along fault lines
heating_element is element. sun's_light is what_heats_earth. magma is rock. earths_core is not magma. earth has molten_core sunlight has effect_of_heating_earth planet_earth has core_of_molten_rock heat is form_of_energy. heat is not form_of_energy. earths_core is magma.