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Lecture Notes for GEOS 1014 - The Earth & Life Through Time with Xiao at Virginia Tech (VT)

Notes Information

Material Type:Class Note 2
Professor:Xiao
Class:GEOS 1014 - The Earth & Life Through Time
Subject:Geosciences
University:Virginia Polytechnic Institute And State University
Term:Fall 2006
Keywords:
  • Hyperthermophiles
  • Black Smokers
  • Hydrosphere
  • Particularly
  • Proterozoic
  • Stromatolites
  • Different Stages
  • Asthenosphere
  • Chloroplasts
  • Similarities
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Sample Document Text

Review Sheet: Part 2 Lecture 6 and 7: Plate Tectonics Core: metallic iron, high density mantle -rocky, intermediate density crust -rocky, low density – Oceanic: thin but denser – Continental: thick but lighter Seafloor spreading - Caused by convection - Ocean crust becomes older ( and cooler and denser) away from the mid ocean ridge - Sedimentary covering becomes thicker and older away from the mid ocean ridge; Magnetic stripes on the ocean floor - Match up on both sides of the mid ocean ridge Today, the geomagnetic poles are about 110 off from the geographic poles Sedimentary covering on the oceanfloor (age and thickness) - Younger and heavier, but thin Types of plate margins (convergent, divergent, and transform fault) Normal Faults Breaking rock in tension (pulling apart, divergent) Reverse Faults Breaking rock in compression (pushing together, convergent) Strike-slip Faults Breaking rock in shear (sliding next to each other, transform) Plate tectonics as a unifying theory of geology (plate tectonics ...

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