EPSC 201 Lecture Notes - Lecture 5: Seafloor Spreading, Continental Drift, Paleoclimatology
29 Nov 2017
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Lecture #5 - plate tectonics - chapter 2. As continents drift apart new ocean floor forms between. Continents converge when ocean floor sinks into the interior. By 1968 a complete model had been developed. Earth"s lithosphere is broke into ~ 20 pieces that interact. Evidence of late paleozoic glaciers found on five continents. Some of this evidence is now far from the poles. These glaciers could not be explained unless continents had moved. Placing pangaea over the late paleozoic south pole: Identical fossils found on widely seperated land masses. These organisms could not have crossed an ocean. Distinctive rock assemblages and mountain belts match across the atlantic. Same age same kind of mountain belts found in north america and africa. Flow the liquid outer core creates the magnetic field. Similar to the field produced by a bar magnet. Magnetic pole tilted 11. 5 degrees from the axis of rotation.
