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MIT 18.01 Single Variable Calculus (OCW)
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OpenStudy (anonymous):
why earth acts as a huge magnet
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OpenStudy (turingtest):
This question belongs in physics, but it is due to electrical currents that exist in the mantle of the earth. The mantle of the earth is like a very viscous liquid that contains many ionized elements and metallic substances. As the liquid mantle moves this causes a current which generates a magnetic field (because an electric current produces a magnetic field).
OpenStudy (anonymous):
There's no definitive answer to that, but the dynamo theory looks adequate: http://en.wikipedia.org/wiki/Dynamo_theory
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