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What would cause the porosity observed in a rock like scoria?
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What would cause the porosity observed in a rock like scoria?

User Robpal
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Scoria is a dark-colored igneous rock with abundant round bubble-like cavities known as vesicles. It ranges in color from black or dark gray to deep reddish brown. Scoria usually has a composition similar to basalt, but it can also have a composition similar to andesite.

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