Geothermal energy is energy that is thermal energy in the Earth. What created this was supernovas. Supernovas created radioactive material long ago when the Earth and the Solar System were being created. Over time, the radioactive material got buried deep in the Earth's crust. That radioactive material created geothermal energy continuously within the Earth's core. Then, at either at a geothermal plant (pictured left) or in our yards, we pump water into the ground and it heats up. Next, we pump it out of the ground for heating. Geothermal energy is thermal energy because it is the energy that gives off heat. It is renewable because the Earth is always producing more. It is kinetic energy because electrons inside atoms move very fast if the object is hot. Geothermal energy is renewable and there are quite a few different places where it would be effective. However, it is not available everywhere, it pollutes a little, and it i s kind of hard to get to. Also, some of the heated water that comes back up is dirty and it smells because of chemicals in it.
This is an example of an energy transformation with geothermal energy as its source. First, magma deep in the Earth heats up water (thermal energy). The water, which turns to steam goes upwards. It spins a turbine transforming thermal energy into mechanical energy. Then, it turns into electrical energy for us to use like to charge our phones.