Is the sun’s energy or earth’s internal heat the cause of melting rock within the earth? explain.

As explained below

Explanation:

Earth's internal heat flow and sun's energy both are duly responsible for the atmospheric and internal heat budget of the planet. The rocks underneath the earth surface in the form of tectonic plates are melted and then subducted inward by the radioactive decay of the planet and this energy created deep inside the earth is responsible for the various tectonic force seen above the land surface in form of tides, earthquakes and this internal hear is divided into two types like radiogenic and primordial heat. This heating process is transported as a result of conduction and convection.  About 80% by mental convention and 1% by volcanic eruption and mountain building.