10F_e_Tectonics_iv

10F_e_Tectonics_iv - Cooling causes contraction more dense...

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Driving Forces of Plate Tectonics (1) Slab pull  - as slab subducts to deeper levels - oceanic crust gets  metamorphosed and becomes more dense than the mantle - cool dense slab sinks at subduction zones and pulls the rest of the plate  with it
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(2) Ridge push  - high elevations at divergent boundaries causes plate to slide  away from ridge under the force of gravity
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Movement of plates combined with heat in the interior of the Earth set up  convection cells  in mantle
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Convection  is a form of heat transfer                                    - occurs in material that can flow Heat cause material to expand less dense - rises
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Unformatted text preview: Cooling causes contraction more dense - sinks Flow forms convection cells e.g., boiling water thunderstorms Mantle flows Hot material rises under divergent boundaries Cooler material descends in subduction zones Size of convection cells unknown How do measure current plate motion GPS (global positioning system)-Uses satellites to precisely determine locations of different areas VLBI (very long baseline interferometry)- uses radiotelescopes to detect signals from very distant quasars- millisecond time differences between two observatories precisely records distances between two places two places...
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This note was uploaded on 02/19/2011 for the course GLY 1000 taught by Professor Vogl during the Spring '08 term at University of Florida.

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10F_e_Tectonics_iv - Cooling causes contraction more dense...

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