NOVA - Earth's Magnetic Field

Yet again PBS's NOVA tickles the intellect with a great topic from the realm of science. This week's program features studies on the earth's magnetic sphere, what purpose it serves, and what its significantly declining force means. Prominent geologists and geophysicists comment on relevant research, many concluding that the magnetic polarity will actually shift, meaning that a compass would then point south. All of this depends on the earth's core, which of course is not able to be directly observed. Instead, scientists look at lava flows as measures of past magnetic field strength and polarity and experiment with molten sodium in efforts to simulate the earth's iron core.

NOVA | Magnetic Storm | PBS
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