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16 April 2010

Volcano Vocab #3: Tephra

Today’s volcano word is tephra, another term that’s directly related to the Eyjafjallajökull- Fimmvörduháls eruptions going on in Iceland at the moment. Tephra (“teff-rah”) refers to any fragmented material thrown from a volcanic vent during an explosive eruption. It comes in different sizes, all of which have their own names (just to make things even more difficult!) Bombs or blocks are large rocks – 64 mm and greater in diameter (cobble to boulder …


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