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16 August, 12:11

In 3-5 sentences, describe how paleomagnetic evidence supports the theory that continents change position (drift) over time.

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  1. 16 August, 15:08
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    The earth magnetic field changes direction and its strength varies from year to year. This results in magnetic anomalies within a rock body as magnetic elements and minerals records the changing direction of the magnetic field.

    As new magma is brought near the mid-oceanic ridge, the older ones are pushed backwards and they show a different magnetic field direction from the cooling magma. This is usually evident in the orientation of the magnetic minerals.
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