sentences: glaciers are a source of freshwater
docs: freshwater_turtle is freshwater_organism. buffalofish is freshwater_fish. rivers is source_of_water. freshwater is anguilloidei. freshwater has less_salt_than_seawater freshwater_fish is freshwater_organism. lake_trout is freshwater_fish. freshwater_bass is freshwater_fish. freshwater_fish is fish. dishwater is water.