Add Yahoo as a preferred source to see more of our stories on Google. An illustration of Earth 200 million years ago as Pangaea, the last supercontinent, began to break apart. The continents we live ...
The early earth / editor, D.R. Nelson. Earth's formation and first billion years / D.R. Nelson. The early Precambrian stratigraphic record of large extraterrestrial impacts / B.M. Simonson, G.R.
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