Approximately 4000 miles underneath the surface of the earth, this phenomenon called geothermal energy is produced deep inside the earth’s core. The earth’s core is composed of three layers; the outer silicate and solid crust, a highly viscous mantle, and a liquid outer core. The outer core consists of extremely hot magma or melted rock wrapping around a solid iron center known as the inner core. The slow decay of radioactive material continually generates extremely high temperatures inside the earth. This is a natural process in all rocks. Geothermal energy dates far back in the ancient times where it was utilized for heating and bathing. Today, hot springs across the world are still being utilized for bathing. It’s a renewable energy source, meaning it’s inexhaustible to humans. It’s also a green source of energy, meaning it does not emit greenhouse gasses that are hazardous to human and environmental health.