Volcanoes warm, then cool, the Earth | A Moment of Science - Indiana Public Media

How do volcanoes impact our planet? Find out more about this explosive science with today's A Moment of Science.

450 million years ago, the Earth was going through a rough time—the planet cooled down dramatically, leading to a glaciation, and soon the planet was seeing one of the most dramatic mass extinctions … [+1539 chars]

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