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Obsidian - Igneous Rock Types - Geology on About.com - The Complete Guide to Geoscience
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日期：2025-06-05
Obsidian is one of the major igneous rock types. ... Your suggestion is on its way! An email with a link to: http://geology.about.com/od/rocks/ig/igrockindex/rocpicobsidian.htm was emailed to:...看更多
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