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Continue to ChatAsk-A-Geologist #8: What is obsidian rock used for? https://blog.minimegeology.com/2014/01/30/ask-a-geologist-8-what-is-obsidian-rock-used-for/
Ask-A-Geologist #8: What is obsidian rock used for? https://blog.minimegeology.com/2014/01/30/ask-a-geologist-8-what-is-obsidian-rock-used-for/