Magnetic Storm - Earth's Invisible Shield 3/3
- Uploaded by Future7 on Jun 21, 2009
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What is weakening Earthâ€™s invisible shield? Magnets have the power to attract and repelâ€”sometimes on a massive scale. The Earthâ€™s molten coreâ€”a violent mix of searing heat, crushing pressure, and a billion trillion tons of liquid ironâ€”creates an invisible shield that surrounds the globe, guarding against a constant barrage of deadly radiation from space. But over the last few decades, the Earthâ€™s magnetic field has weakened dramatically, intriguing scientists across the globe.
The power generated 2000 miles beneath our feet protects us every day, but the loss of Earthâ€™s magnetic field is a brewing storm that affects us all. While experts research and debate, persistent questions remain. Is a rare geomagnetic reversal the cause of earthâ€™s inner turmoil? And if the magnetic field were to vanish altogether, would Earth become as lifeless as Mars?
Travel from Hawaiiâ€™s molten lava flows to the mountains of Oregon and into the far reaches of outer space for a charged look at Earthâ€™s magnetic history and potentially deadly future.