Journey to the Earth's Core
Mysterious underground forces -- stretching to some 4,000 miles to the heart of Earth -- impact the existence of those on the surface.
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Humans have mapped every corner of the globe--from jungles and deserts, to outer space. Yet we've gone only 7 miles below the Earth's surface. Go deeper into the heart of our planet: 4,000 miles down.
S2012:E0 • May 17, 2012 • 1hr 28mMore Like This
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