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How do scientists know that earth's magnetic poles have reversed many times during history

How do scientists know that earth's magnetic poles have reversed many times during history
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How do scientists know that earth's magnetic poles have reversed many times during history

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User Kasun Kariyawasam
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In ocean basalts ,as the sea floor slowly spreads igneous rock which is comprised cools and congeals,recording earth current
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User Dexters
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