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Lecture 12

Lecture 12 - Plate Tectonics

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Earth Sciences
Earth Sciences 1022A/B
Stephen R Hicock

Lecture 12 NotesPlate Tectonics y Continental Drift and Paleomagnetism o Magnetic minerals act like fossil compass needles pointing to where paleo magnetic poles used to be o Divergent polar wandering paths show that continents drifted apart y Seafloor Spreading moves seafloor away from oceanic ridges toward ocean trenches y Geomagnetic Reversals magnetic poles have reversed polarity striped sea floor gets older away from oceanic ridges y Rigid plates of the lithosphere y Plate Tectonics o 7 major plates of the rigid lithosphere ride on plastic asthenosphere o Interactions of plates cause earthquakes volcanoes and mountain building y Plate Boundaries o Divergent plates move apartsea
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