lec 10 - GE105 Continents Adrift Continents Adrift 11 Plate...

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Unformatted text preview: GE105 Continents Adrift Continents Adrift 11 Plate tectonics – collision zones Lecture 1. Introduction and course overview. Lecture 2. Distance and time. Lecture 3. Planet building and Earth’s layered structure. Lecture 4. Wegener’s Continental Drift hypothesis. Lecture 5. Earth’s magnetic field and polar wander. Lecture 6. Reversals and seafloor spreading. Lecture 7. Plate tectonics – spreading and rifting. Lecture 8. Plate tectonics – collision zones Lecture 9. The wave that shook the world (movie) Lecture 10. Earthquakes Lecture 11. Volcanoes Lecture 12. Mantle convection and wrap-up Lecture 13. Final Exam (FEBRUARY 17, 2011) GE105 GE105 Continents Adrift GE105 Continents Adrift 22 Volcanoes occur where Earth’s surface is cracked … ISLAND ARC MID-OCEAN RIDGE HOTSPOTS CONT. ARC GE105 Continents Adrift The temperature inside the Earth Earth’s temperature drops only about 100oC per billion years. Asthenosphere : (100-300 km) layer directly beneath mobile tectonic plates where the temperature approaches the melting temperature. Outer core : (2890-5100 km) molten layer of iron alloy where magnetic field originates Inner core : (5100-6370 km) solid iron GE105 33 Continents Adrift GE105 Continents Adrift...
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This note was uploaded on 02/17/2011 for the course GEOSCI 105 taught by Professor Ritsema during the Winter '11 term at University of Michigan.

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lec 10 - GE105 Continents Adrift Continents Adrift 11 Plate...

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