Question

geothermal energy, a possible energy resource, is based on which phenomenon? there are concentrations of heat in some places of earths crust. earths internal energy heats its surface more than the sun does. heat energy from the sun penetrates deep into earth. human activity is the largest source of heat energy on earth.

Explanation:

Geothermal energy utilizes heat from the Earth's interior. The Sun's heat mainly affects the surface, and human activity isn't the main source for geothermal. The key is the heat concentrations in the Earth's crust as shown in the diagram (with high - temperature areas like \(300^{\circ}C\) deep down).

Answer:

There are concentrations of heat in some places of Earth’s crust.