GEOL 104 Final: Geo Final Test Study Guide
7 Jan 2018
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Document Summary
Plate tectonic system: (lithosphere and asthenosphere; deep mantle) Geodynamo system: (inner and outer core) (magnetic field similar to a bar magnet) Principle of uniformitarianism: the concept that today"s geologic processes work the same way as they did in the past and will in the future. The earth is considered to have a bi-level surface due to the composition of oceanic crust and continental crust. Moho: 40km down separation between the crust and mantle made of peridotite. Basalt makes up oceanic crust with density of 3. 0. Granite makes up most of continental crust with density of 2. 7. Continental drift: now defunct theory of how continents are in their current position; replaced by plate tectonics. Plate tectonics: modern theory that states that continental plates move around via mantle convection in crust is created by seafloor spreading and destroyed by. Recycling of crust takes place at ~700km depth. Divergent boundaries: plate boundaries that separate (oceanic spreading centers, continental rift zones)
