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Why do some igneous rocks have bubbles or pores and are these rocks intrusive or extrusive?

April 26, 2017bubbles extrusive igneous intrusive pores rocks

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Why do some igneous rocks have bubbles or pores and are these rocks intrusive or extrusive?

1 Answer

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10 Posted

The bubbles and pores are from trapped gasses which expanded in the molten material as it neared the surface. They’re usually found in extrusive igneous rocks, those that have solidified in the air or on the surface.