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BYU - PHY S 100 - Chapter 27, Week 12 Notes - Class Notes

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BYU - PHY S 100 - Chapter 27, Week 12 Notes - Class Notes

School: Brigham Young University
Department: OTHER
Course: Physical Science
Professor: Patricia Ackroyd
Term: Spring 2017
Tags:
Name: Chapter 27, Week 12 Notes
Description: Tectonic Plates, Seafloor spreading, hot spots
Uploaded: 12/10/2017
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background image Chapter 27: Continental Drift and Plate Tectonics   Evidence for Continental Drift    
Jigsaw Fit of the Continents 
•  Wegener termed Pangaea, noting that the continents fit together in a jigsaw shape    
Continental Structure 
•  Structural trends cross continents, hinting at a combined land mass (ex: mountain belts)    
Paleontological (Fossil) Evidence 
•  Similar fossils live in widely separated lands; dinosaurs incapable of crossing large bodies of water 
manage to leave fossils in continents separated by oceans 
  
Paleoclimatic Evidence 
•  Rocks give us clues about ancient climates; tell us that eastern South American, India, Southern 
Africa, and Southern Australia had the same climate as Antarctica (ancient glaciation formed one 
single region) 
  
Paleomagnetic Evidence 
•  Basaltic lava leaves a magnetic field on land; continents have same orientations of magnetic fields 
when aligned in Pangaea shape 
   Seafloor Spreading  •  Studies of ocean floor in 50s and 60s led to discovery of the mid-Atlantic ridge, which matches 
exactly with drift pattern  
Discovered ridges and trenches     The Theory of Tectonic Plates  Magnetic Reversals and Stripes on the Seafloor  •  Every 1/2 million years, earth's polarity has flipped  •  Development of magnetic stripes of reversing polarity --> lava comes up at oceanic ridge, pushing 
the seafloor to the sides 
Earthquakes and Plate Boundaries  •  Earthquakes happen at ocean trenches and ridges  •  Biggest tectonic plate: Pacific      Parts of Tectonic System  Divergent Plate Boundaries  •  Two plates pull away from each other --> lava rises up and solidifies, pushing plates apart    
Convergent Plate Boundaries:  
•  Ocean-ocean plate collisions  Subduction: in a collision, one plate will dive under the other and sink into the 
Asthenosphere (lower density plate underneath) 
Creates massive earthquakes and volcanic eruptions 

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School: Brigham Young University
Department: OTHER
Course: Physical Science
Professor: Patricia Ackroyd
Term: Spring 2017
Tags:
Name: Chapter 27, Week 12 Notes
Description: Tectonic Plates, Seafloor spreading, hot spots
Uploaded: 12/10/2017
2 Pages 15 Views 12 Unlocks
  • Better Grades Guarantee
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  • Notes, Study Guides, Flashcards + More!
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