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How are earth's magnetic field reversals recorded in the ocean floor?.
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How are earth's magnetic field reversals recorded in the ocean floor?.

User Perri
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Magnetic reversals - Evidence suggests that the earth's magnetic field has periodically reversed its polarity in the past. ... Small magnetite crystals in a cooling lava flow act like tiny compass needles, preserving a record of the earth's magnetic field when the lava solidifies.

User Telexper
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