Plate Tectonics and Earthquakes

Plate Tectonics and Earthquakes - Plate Tectonics and...

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Plate Tectonics and Earthquakes 18:07 Tsunami: effect of earthquakes in ocean Continental drift: Gondwanaland: India, Australia, Antarctica, S. America, Africa,  Madag., Sri Lanka – Alfred Wegner (1915): couldn’t prove continental drift; used ages of rocks,  distinct,  S. Africa, has pebbles from melting glaciers/icebergs, rock Tillite (rock) in India,  S. Africa, Madagascar, etc.  Due to need to map ocean for subs, found ocean ridges, the missing link for plate  tectonics, ridge like a seam on a baseball, weaves in and out of the world—all  basalt rocks Ridges are youngest part, older as you go out Today, oceans are all spreading, 6 cm /year avg.  Symmetry of ocean crust Iceland: river falling into a ridge valley, spreading ridges rise above the sea floor Scientific method: come up w/ a hypothesis I’m melting, I’m melting!!!! Hot spring spewing minerals at floor
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Plate Tectonics and Earthquakes - Plate Tectonics and...

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