lec 4 - GE105 Continents Adrift Continents Adrift 11...

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Unformatted text preview: GE105 Continents Adrift Continents Adrift 11 Earth’s layered structure 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 sea floor spreading. Lecture 7. Plate tectonics – spreading and rifting. Lecture 8. Plate tectonics – collision. Lecture 9. The wave that shook the world (movie) Lecture 10. Earthquakes I. Lecture 11. Earthquakes II. Lecture 12. Volcanoes and mantle convection Lecture 13. Final Exam (FEBRUARY 17, 2011) GE105 GE105 Continents Adrift Continents Adrift 22 Earth as a layered planet MANTLE: bulk of the solid Earth , comprised of (Fe,Mg) Si03 and (Fe,Mg)O. CORE: Iron (Fe) and Nickel (Ni), liquid . Currents in the core generate Earth’s magnetic field The inner-core is solid . CRUST: The lighter elements (O, Si, Al), formed by melting of the mantle. The crust is about 10 km thick beneath the oceans and about 30-70 km beneath the continents . GE105 GE105 Continents Adrift Continents Adrift 33 Earth differentiation III Earth’s composition: From the 100 elements 8 elements make up 99% of Earth’s mass. In fact, only 4 elements make up 90% of Earth’s mass ....
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lec 4 - GE105 Continents Adrift Continents Adrift 11...

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