For all that it seems static to us, the Earth is constantly in subtle motion in little and big ways. If you’ve ever lived on a farm in a region with stony ground and tough winters, you’ll know that the spring thaw brings a crop of fresh stones. The cycle of freezing and thawing slowly moved buried stones closer to the surface, and that happens with a lot of things. Human activity in previously unsettled areas also leads to the discovery of something new every so often. Erosion over centuries can expose long-hidden secrets.
Lots of mechanisms exist which mean that there’s always new strata being exposed, and all that goes with it.
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