geothermal energy is a renewable resource
geothermal_energy is not heat. geothermal_energy is not tangible_thing. geothermal_energy is not energy. natural_gas is renewable_resource. wood is renewable_resource. renewable_energy is energy. renewable_energy is not energy. geothermal_energy is tangible_thing. geothermal_energy is energy. geothermal_energy is heat.