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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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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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