GLGY 209 Chapter Notes - Chapter 11: Large Low-Shear-Velocity Provinces, Laramide Orogeny, Oceanic Crust

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There are gaps in earth"s rock record that do not provide a concise and clear descripion of how old the earth is. The gap in earth history known as the hadeon eon, describes the distance between the oldest rock found in 4. 03 ga and the oldest coninental crust at 3. 85 ga. This era is named ater hades of greek mythology because of periods of earth inferno. The process of internal difereniaion describes how the earth moved, afected by gravity, pulled molten iron inward to the center of the earth. Scienists suggest that soon ater this, a meteorite hit the developing earth, and the debris that fell of created the moon. However, a rock record of this does not exist. So there is no way to prove that. 11. 3 the archean eon: birth of the coninents: The archean eon began the formal process of the creaion of the earth"s crust.

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