Erosion has revealed rock formations that date back 2,600 million years - 600 million years earlier than the oldest rock formation in the Grand Canyon.
(Erosion; has revealed; rock formations that date back 2,600 million years; T:600 million years earlier than the oldest rock formation in the Grand Canyon) (rock formations; date; back)
Erosion rock formations
has revealed date
rock formations that date back 2,600 million years T:600 million years earlier than the oldest rock formation in the Grand Canyon
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