BYU - PHY S 100 - Class Notes - Week 12
View Full MaterialSchool: Brigham Young University
Department: OTHER
Course: Physical Science
Professor: Patricia Ackroyd
Term: Spring 2017
Tags:
Name: Chapter 26, Week 12 Notes
Description: The mechanical and compositional layers of the earth, including evidence for these layers
Uploaded: 12/10/2017
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rubber band) • Seismic waves: produced by earthquakes o Tectonic plates grind against each other. Pressure underneath snaps a section of plate,
creating shock waves • Compression waves: P-waves • Shear waves: S-waves • Surface waves: slowest and last to arrive, cause devastating tsunamis, create most earthquake
damage, only travel in solids • Focus: where earthquake originates (epicenter: point on surface directly above focus) • Seismic discontinuity o Place where velocities of seismic waves change abruptly (proof that density of rock changes
abruptly with depth) • Shadow zones (no seismic waves) is proof of boundary between solid mantle and liquid layer
below (outer core) Evidence from Earth's Magnetic Field • Curie temperature: at 760 degrees C, iron loses its magnetism…so how is Earth's magnetic field
produced, if not in the core? • Convection between top and bottom of outer core, iron atoms move as electrical conductors o Electrical currents in outer core --> magnetic field Mechanical Layers of Earth • Refers to the physical behavior of the rocks in the layers Lithosphere: outermost rigid, brittle, skin-like layer • From surface to uppermost part of mantle • Granite in continental crust, basalt in oceanic crust, and peridotite in mantle
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School: Brigham Young University
Department: OTHER
Course: Physical Science
Professor: Patricia Ackroyd
Term: Spring 2017
Tags:
Name: Chapter 26, Week 12 Notes
Description: The mechanical and compositional layers of the earth, including evidence for these layers
Uploaded: 12/10/2017
2
Pages
18
Views
14
Unlocks
- Better Grades Guarantee
- 24/7 Homework help
- Notes, Study Guides, Flashcards + More!
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