Where does the heat that produces geothermal energy come from?

What if your body produces heat constantly Where does this energy come from?

• Answer:

  food. The energy that makes our body warm, (aside from the Little bit of heat that comes directly from our surrounding's) comes from the sun. Plants convert the suns light using a process called photosynthesis and carbon dioxide into starches and sugars as well as releasing the oxygen that we need to oxidise the food we eat. When we eat these things we recombine them with oxygen which is an exothermic reaction (releases heat)