Ongoing evolution of ideas about the evolution of the earth.
May have cooled earlier, therefore a slower evolution of life.
Having been a "student" of geology since at least the '60's (Oberlin College, where, on the leading edge, we had "Continental Drift" before Plate Tectonics) I've been fascinated with the ongoing evolution of thought and theories.
A New View of the Early Earth, Thanks to Australian Rocks - NYTimes.com:
"Geologists now almost universally agree that by 4.2 billion years ago, the Earth was a pretty placid place, with both land and oceans. Instead of hellishly hot, it may have frozen over. Because the young Sun put out 30 percent less energy than it does today, temperatures on Earth might have been cold enough for parts of the surface to have been covered by expanses of ice."
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