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Andrew's Geology Blog

By Andrew Alden, About.com Guide to Geology since 1997

Weekend Browsing: Extrusive Igneous Rocks

Saturday November 15, 2008
igneous rocksThere's a wide variety of rocks to be found in, near and around volcanoes—the extrusive igneous rocks. Here are a couple dozen pictures of the major types, tuffs and flows of all kinds, ready for you to sit back and click 'em.

Obsidian — Geology Guide photo

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