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Earth Sciences 22 Online
angelfish:

What information does the geologic time scale provide? A. explanation of how Earth formed B. places where dinosaurs roamed on Earth C. reasons why organisms evolve into different species D. information about when plants first appeared

JessicaF:

Hadean. The oldest of the geologic eons is the Hadean, which began about 4.6 billion years ago with the formation of... Archean. The next geologic eon, the Archean, began about 4 billion years ago. During this period, the cooling of the... Proterozoic. The Proterozoic eon began about 2.5 billion years ago and ended about 500...

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