I was on a hike and read a plaque that said this area used to be completely covered by water. My question is, where did all that water go? Just absorbed into the ground? Evaporated?
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Sea levels have changed over time (e.g. due to melting and freezing of the ice caps) but in that particular case it’s more likely that the spot you were on used to be at a much lower elevation, and geologic activity has pushed it up above sea level.
Fun fact: the very top of Mount Everest is made of grey limestone, which only forms in underwater environments, and contains fossils of marine organisms. So around 450 million years ago, it was underwater too.
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