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January 9, 2013

LASI V: Xeno-Pumice– Mysterious Floating Rocks of the Canary Islands

Note: Dr. Steffi Burchardt, a senior lecturer in Structural Geology at Uppsala University in Sweden, presented a talk, “Xeno-pumice erupted offshore El Hierro, Canary Islands: A tale of stoped blocks in magma chambers?” at the LASI V workshop in Port Elizabeth, South Africa in October 2012. The article below is based on this talk and also an interview with Dr. Burchardt. Over a few weeks, I am highlighting some of …


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November 10, 2010

Geology Word of the Week: B is for (Volcanic) Bomb

Fiesty Arenal Volcano, Costa Rica, June 2008. This week’s geology word of the week is actually a phrase: volcanic bomb. def. Volcanic Bomb: A rock that forms when lava is thrown up into the air and cools very quickly. Volcanic bombs have characteristic shapes that they take on when they turn and twist in the air as they cool. They are often tear-drop shaped with a long tail. To be …


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