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Unformatted text preview: Chapter 29 Plate Tectonics Did you read Chapter 29 for today? Did you read Chapter 29 for today? c) c) Yes Yes d) d) No No Quiz Which shadow zone is larger? a) P-wave ) ave b) S-wave c) Depends on the orientation of the Earth with respect to the Sun. Quiz Compared to the lithosphere, the asthenosphere: a) Floats on top (above) the lithosphere b) Is less brittle and less dense c) Is more brittle and more dense d) Is less brittle and more dense e) Is more brittle and less dense Plate Tectonic Model Plate Motions s Plates move at The fastest Plate Tectonics -- the Model ot material ot material Lithosphere Lithosphere Crust Crust Upper Mantle Upper Mantle Asthenosphere Asthenosphere PS 100 JBG Day 30 6 Hot material Hot material rises rises Lithosphere Lithosphere is broken into about a dozen large plates. is broken into about a dozen large plates. Plates, floating on the Plates, floating on the asthenosphere asthenosphere , are mobile. , are mobile. ( 1 to 15 cm per year 1 to 15 cm per year ) Gravitational and electromagnetic Gravitational and electromagnetic forces push the plates. forces push the plates. Energy comes from Energy comes from radioactive decay radioactive decay of atoms in of atoms in lower mantle. lower mantle....
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This note was uploaded on 11/30/2011 for the course PHY S 100 taught by Professor Staff during the Winter '08 term at BYU.
- Winter '08