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NOVA

A Volcanic Labyrinth

Clip: Season 40 Episode 1 | 2m 59s

Thrihnukagigur crater is the only place on Earth where the anatomy of a volcano can be studied from the inside. When geologists journeyed into its heart, they discovered that a network of fissures links together distant volcanoes.

Aired: 01/02/13

Rating: NR

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