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RT @DurUniEarthSci: Question: How do you make #obsidian? Answer: by welding tiny #volcanic ash particles that stick while still hot! Check…
RT @DurUniEarthSci: Question: How do you make #obsidian? Answer: by welding tiny #volcanic ash particles that stick while still hot! Check…
RT @DurUniEarthSci: Question: How do you make #obsidian? Answer: by welding tiny #volcanic ash particles that stick while still hot! Check…
RT @Durham_Volc: New paper by some of the @Durham_Volc team https://t.co/JCmp9i249h
RT @DurUniEarthSci: Question: How do you make #obsidian? Answer: by welding tiny #volcanic ash particles that stick while still hot! Check…