National Geographic Channel Naked Science

Season 2 Episode 1

Earth's Core

Aired Thursday 8:00 PM Jan 05, 2005 on National Geographic
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Episode Summary

Earth's Core
The Earth's core is some 4000 miles beneath our feet. Beneath the rocky surface lies massive amounts of liquid metals that generate a protective magnetic field. That field shields the planet from dangerous space radiation. Without it, Earth would be as barren as Mars. But with the inner core cooling, is that scenario inevitable?moreless

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