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 crust is constantly moving and being redistributed. Things like wind, mudslides, floods, earthquakes, sink holes, plant growth, and animal activities are all moving the crust that we live on. Volcanic eruptions and the areas around the tectonic plate edges are moving some of the molten layer to the surface as well. So over great lengths of time, things get buried by the natural movement of the ground beneath us.
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