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What are the characteristics of extrusive igneous rocks?

Answer:
In addition to having small crystals, an extrusive igneous rock can:

Be glassy or frothy in appearance.
Be felsic, intermediate, mafic, or ultramafic in nature.
Be porous or full of bubbles.
Be light enough to float (pumice).
First answer by Jones1rocks. Last edit by Jones1rocks. Contributor trust: 1565 [recommend contributor recommended]. Question popularity: 2 [recommend question].

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