🌐EnglishEnglishEspañolFrançaisItalianoPolskiРусский中文EntityQ2375668· pop 9· linked from 139 articlesObsidian hydration datingscientific method used to age or date obsidian objectsConnectionsarchaeologyEntitygeochemistryEntityCategoriesAmerican inventionsDating methodologies in archaeologyGeochemistryObsidian