sentences: geothermal energy is a renewable resource
docs: solar_power is clean_renewable_energy_source. bio_energy is renewable_energy. geothermal_energy is energy. renewable_resource is natural_resource. geothermal_energy is heat. geothermal_energy is tangible_thing. solar_energy is alternative_energy. wood is renewable_resource. natural_gas is renewable_resource. renewable_energy is energy.