Scientists have researched the causes and effects of the Earth's magnetic field, and recently have wondered why it has weakened in the last few decades. NOVA takes a look at the elements of the field, from the molten core to the far reaches of space, to find some answers.DVD Features:Region 0Keep CaseLetterboxed - Anamorphic - 1.85Audio: Dolby Digital 2.0 - EnglishInteractive Features: Interactive Menus Scene AccessDVD-Rom Features: Printable Materials for Educators Access to the Magnetic Storm Web Site
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