They are, but really slowly. If you look at [really old cemeteries](https://www.google.com/maps/@52.1066045,0.4641741,3a,75y,217.68h,79.85t/data=!3m6!1e1!3m4!1sZY7wDpq5Qj4AR8iU7QZf3g!2e0!7i16384!8i8192?entry=ttu), you might notice that they tend to be elevated above the surrounding ground. That’s because of thousands of years of bodies being buried there.
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