- uploaded: Jun 21, 2009
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What is weakening EarthĂ˘â‚¬â„˘s invisible shield? Magnets have the power to attract and repelĂ˘â‚¬â€ťsometimes on a massive scale. The EarthĂ˘â‚¬â„˘s molten coreĂ˘â‚¬â€ťa violent mix of searing heat, crushing pressure, and a billion trillion tons of liquid ironĂ˘â‚¬â€ťcreates an invisible shield that surrounds the globe, guarding against a constant barrage of deadly radiation from space. But over the last few decades, the EarthĂ˘â‚¬â„˘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 EarthĂ˘â‚¬â„˘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 earthĂ˘â‚¬â„˘s inner turmoil? And if the magnetic field were to vanish altogether, would Earth become as lifeless as Mars?
Travel from HawaiiĂ˘â‚¬â„˘s molten lava flows to the mountains of Oregon and into the far reaches of outer space for a charged look at EarthĂ˘â‚¬â„˘s magnetic history and potentially deadly future.