How strong is lava once it cools down and hardens?



  1. 0 Votes

    Lava ends up being anything as strong as solid glass obsidian — very strong — to pumice, which can be etched with a fingernail, or crushed underfoot. Obsidian is so strong that it was used by ancient people to make hand weapons.

    The link below is a short, but rather surprising page about pumice.

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