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Transcript
Pop Quiz! 7.__ 6.__ 5.__ 8.__ 3.__ 4.__ 2.__ 1.__ Inner Core Mantle Mesosphere Outer Core Asthenosphere Ocean Crust Lithosphere Continental Crust Pop Quiz! Ocean Crust 7.__ Continental 8.__ Crust Lithosph. 5.__ 6.__ Asthenosphere Mantle 3.__ 4.__ Mesosphere Outer Core 2.__ Inner Core 1.__ 3 Types of heat transfer 1. Convection transfer of heat through large scale fluid flow. flow caused by density differences due to temperature differences 3 Types of heat transfer 2. Conduction Transfer of heat by direct contact 3 Types of heat transfer 3. Radiation Transfer of heat through electromagnetic waves Deep Earth Plate Tectonics - Driving Forces •Convection •Slab Pull •Ridge Push Short Story: heat trying to escape Plate Tectonics - Driving Forces •Convection •Slab Pull •Ridge Short Story: heat trying to escape Seismic Tomography Warm, less dense Cold, more dense Is the mantle a liquid? Doesn’t convection happen in fluids? Mantle is like silly putty: Short term: acts like solid Long term: has some behavior like liquids The Core Liquid outer core found using seismology: no S-waves travel in liquids Convection in Fluid Outer Core produces Earth’s magnetic field Deep Earth Summary: Composition Crust: density: 2-3 g/cm3 Mantle: “Rocky” (Silicates) density: 3-6 g/cm3 Outer Core: Mostly Iron density: 10-12 g/cm3 Inner Core: Mostly Iron density: 13 g/cm3 Deep Earth Summary: Heat Flow Mantle: Convection Outer Core: Convection & Conduction Inner Core: Conduction
