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volcanic rock |
Also found in: Wikipedia, Hutchinson | 0.03 sec. |
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volcanic rock [väl′kan·ik ′räk] (geology) Finely crystalline or glassy igneous rock resulting from volcanic activity at or near the surface of the earth. Also known as extrusive rock. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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