111-pp3 - UNIVERSITY OF SOUTH ALABAMA Last Time 1. GY 111:...

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GY 111: Physical Geology GY 111: Physical Geology UNIVERSITY OF SOUTH ALABAMA Lecture 3: The Rock Cycle Lecture 3: The Rock Cycle Lecture 3: The Rock Cycle Last Time 1. Alfred Wegener and “Drifting Continents” 2. The Plate Tectonic Revolution 3. Plate Tectonics Mechanisms Alfred Wegener Matching rock types and fossils* * types and ages Radar, sonar, and depth sounding revealed that the ocean bottoms were not flat planes The Plate Tectonics Revolution Earth has a magnetic field (and it isn’t constant) The Plate Tectonics Revolution Paleomagnetism shows that the ocean floor youngest near the ridges and oldest near the continents The Plate Tectonics Revolution
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Internal “guts” of the Earth Four Major “Geophysical” Layers 1) The Crust 2) The Mantle 3) The Outer Core 4) The Inner Core (1270 km; solid metal) Cooler Hotter The Plate Tectonics Mechanism Collectively, the rigid outer most part of the Earth (about 100 km thick) is called the Lithosphere Crust Mantle Geophysical layers Lithosphere: Athenosphere: Tectonic layers The Plate Tectonics Mechanism Tectonic plates can interact in one of 3 ways 1) Move away from one another: Divergent Plate Boundary 2) Move towards one another: Convergent Plate Boundary
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111-pp3 - UNIVERSITY OF SOUTH ALABAMA Last Time 1. GY 111:...

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