Smarty Pants Quiz
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What rock is a type of glass made by volcanoes?
Basalt
Flint
Obsidian
Limestone
Almost... Try again!
When volcanoes erupt explosively the magma meets air and water quickly and "freezes" in place. It cools so fast that mineral crystals cannot form.
Easy peasy lemon squeezy! Try here!
09
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What rock is a type of glass made by volcanoes?
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