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Magnetic Storm
This site is a companion to a Public Broadcasting Service (PBS) NOVA program about the magnetic field that protects the Earth from radiation, its current weakening and potential for continuation or reversal, and effects of these changes on animals. The site features essays, images of auroras ("the most visible signs of Earth's magnetic field"), a simulated flip of the Earth's magnetic field, a teacher's guide, and related links.
http://www.pbs.org/wgbh/nova/magnetic/
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