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Download Plate Tectonics - Historical Development
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Transcript
Carrie Armstrong, Erin Rickert, Lydia Nguyen, Emmy Penquite •German Scientist •First to actively pursue the idea of a super-continent •Also came up with the theory of continental drift How he got started: •The first clue Wegener had was the matching coast lines • he said they were almost like pieces of a jigsaw puzzle •Then noticed that other continents seemed to fit together to Lithosphere • outer part of the Earth •Includes the crust and the mantle • about 100 km thick lithosphere Asthenosphere •The ductile part of the earth just below the lithosphere •Includes the lower mantle •Referred to as hot plastic •About 180 km thick asthenosphere Tectonic Plates •The tectonic plates glide over the asthenosphere at relates ranging from 1-16cm per year •Movement resembles ice drifting across a pond Continental Drift •The continents and ocean basins make up the upper parts of the plates •As the plates glide the ocean and continents move with it •link Geological activity • Most of this activity occurs at plate boundaries • Three types of plate boundaries exist 1. divergent 2. convergent 3. transform
