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Obsidian is basically “unpopped” pumice: obsidian and pumice are igneous rocks that are made out of the same material, but because of the way it’s formed inside the volcano, pumice looks very different and is much less dense than obsidian. In what ways is pumice it different from obsidian? In what ways is it similar to popped popcorn? How does a difference in density affect something? How is it possible for two things made out of the same material have very different appearances and densities?
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Fecha publicación: 12.5.2016
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