Obsidian
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| Subject | Replies | Date | |
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What are interesting facts about obsidian rocks? | 0 | 12/8/2013 |
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What characteristics of obsidian make it an exception to the strict definition of a rock? | 0 | 9/23/2013 |
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What is obsidian's mineral composition? | 1 | 8/30/2013 |