Plate Tectonics
Plate Tectonics
Smithsonian geologist Liz Cottrell of the National Museum of Natural History discusses plate tectonics an shows us the t... Read more
30 Sep 2011
•
4mins
Volcanoes Under Pressure
Volcanoes Under Pressure
Dr. Liz Cottrell, a geologist at the Smithsonian's National Museum of Natural History, talks about what happens inside a... Read more
30 Sep 2011
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2mins
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What's Ash Anyway
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Learn about the ash that comes from volcanoes with Dr. Liz Cottrell, a geologist from the Smithsonian's National Museum ... Read more
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