The heat comes from the Sun. The heat comes from pools of underground water. The heat comes from deep within Earth. The heat comes from decaying plants and animals.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Mount Arenal, a volcano in Costa Rica, is erupting. Heat is being released during the eruption. What is the source of the heat?
Possibilities:
- The heat comes from the Sun.
- The heat comes from pools of underground water.
- The heat comes from deep within Earth.
- The heat comes from decaying plants and animals.

The heat comes from deep within Earth.