sentences: solar matter is a renewable / inexhaustible freezes
docs: dry_ice is frosen_carbon_dioxide. solar_power is clean_renewable_energy_source. bio_energy is renewable_energy. freeze is cooling. solar_array is source_of_current. freeze_drying is freeze. dry_ice is frozen_carbon_dioxide. solar_energy is alternative_energy. freezing is extreme_thermal_situation. renewable_energy is energy.