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1 September, 19:35

What evidence first supported the theory of seafloor spreading?

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  1. 1 September, 19:47
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    1. Rocks near mid-ocean ridge were younger than rock near trenches

    2. Matching bands of magnetic rocks were found on either side the mid-ocean ridge; bands like tree rings - record changes in earth's magnetic field over time

    3. Earthquake data showed oceanic crust is sinking on to the mantle at trenches
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