From the perspective of a satellite in space, the moraines look like the ripples on sand at the beach, or look like piles of leaves left behind after rain pours across a driveway in the fall or numerous other similar phenomenon. Anyway, people noticed those very subtle landforms, made more measurements of the composition of piles of dirt left behind by the ice ages, sent out teams of people to check it out in more detail, and reconstructed the ice age history of the US, and states like Ohio in detail.
My property is in the middle of one of the moraines from 14,000+ years ago. Part of my property was actually under water for a very long time in an earlier episode of ice ages which came and went over the past hundreds-of-thousands of years.
One of the lessons from geology is human civilization is not very important. We live in the shadow of forces that are much more powerful than humanity's tools and knowledge. Religions put humanity near the center of the universe, basically orbiting around some "god" character. Nope, we're just another animal on earth that will come and go and probably won't last even as long as animals like possums.
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