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Unformatted text preview: Exam 2 Study Guide Chapter 8 – The Dynamic Planet Endogenic system – encompasses internal processes that produce flows of heat and material from deep below the crust, powered by radioactive decay ( the solid realm of Earth ) Exogenic system – involves external processes that set in to motion air, water, and ice, al powered by solar energy ( the fluid realm of Earth’s environment ) Geomagnetic reversals – When the magnetic field fades to zero then phases back to full strength, but with the poles reversed. This has happened 9 times during the past 4,000,000 years. Asthenosphere – Plastic layer about 70km down to about 250km down; the least rigid portion of Earth’s interior; the slow movement in this zone creates tectonic activity (folding, faulting, and general deformation) Rock & rock cycle – produces the three basic rock types found in the crust Igneous rock – rocks that solidify and crystallize from a molten state (granite, basalt, rhyolite) Sedimentary rock – formed from the compaction, cementation, and hardening of sediments (lithification)...
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- Spring '08
- Plate Tectonics, Alfred Wegener, Crustal plate movements, crust Igneous rock, plate Convergent boundaries