Oceanic plates can be different densities older are

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Unformatted text preview: something about the age of the rocks The crust is much younger at the ridges, and gets older and older as we go out form there. Evidence then that these boundaries were very important. Gave rise to plate tectonics What’s going on in plate tectonics? It all has to do with density. The outer crust is floating on top. The locations of seismic activity are ridges where seafloor spreading is happening. Forming new oceanic cr...
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