BYU - PHY S 100 - Chapter 27, Week 12 Notes - Class Notes
View Full MaterialSchool: 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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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 o 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 o Subduction: in a collision, one plate will dive under the other and sink into the
Asthenosphere (lower density plate underneath) o 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
12
Views
9
Unlocks
- Better Grades Guarantee
- 24/7 Homework help
- Notes, Study Guides, Flashcards + More!
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