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Stories by Richard R. Doell

Reversals of the Earth's Magnetic Field

Some volcanic rocks are magnetized in a direction opposite to that of the present magnetic field of the earth. The reason is that the earth's field has reversed nine times in the past 3.6 million years

February 1, 1967 — Allan Cox, Richard R. Doell and G. Brent Dalrymple
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Scientific American Health & Medicine

Scientific American Health & Medicine