GEOG 101 Lecture Notes - Lecture 12: Asthenosphere, Uniformitarianism, Anthropocene
Document Summary
Earth has been around for 4. 5 billion years. Knowledge of relative rather than absolute time. Uniformitarianism the same physical processes that are active in the environment today have been operating throughout geologic time . We are in the holocene right now, although some people think we should refer to this era as the anthropocene. Anthropocene human affected: the earth"s interior. Can travel through solids, but not air or water. The velocity of the waves will increase with density. Because of the pressure (not the temperature) 6000 degrees in the center of the earth. Result of earths rotation magnetic field is created. We have magnetic north as a result. Every 450,000 years, the north/south alignment switches. **mantle = 80% of the earth volume. Described as a plastic solid but flows more easily. Very strong geothermal energy reaches near the surface of the earth. Differentiation reflecting the mineral content of the crust, within the earth folded.
