Geothermal Energy – A Green Energy Source?

Geothermal energy is energy obtained by tapping heat from the earth itself. This comes from magma and the radioactive decay of uranium, thorium, and potassium.
The downside to geothermal energy is the fact that it’s expensive to build. On the other hand, because the earth’s crust continuously decays replenishing the heat, it’s still a renewable source [...]