Layers of crust from millions of years ago are in layers below the outermost crust, which would make sense if the earth was constantly growing in mass and size. Like in millions of years we will fossilize and structures will be buried but unless things just sink into the ground or there is mass added how do older layers of crust get underground?
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The North Pole is ice floating on top of water with no land. It’s not exactly the same ice but there’s always ice there. Ice falls into water, water falls on ice and becomes ice in a basically endless and closed cycle. The crust is doing that too (continental drift is a thing), just much much slower at much much higher temperatures.
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