SCI 102 Midterm: SCI Exam 2 Study Guide
14 Dec 2016
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Continental drift- original theory to explain shape and location of continents (early. Ancient climate evidence (paleoclimate: coal deposits- form in swaps (along continental boundaries, glacial ice. Continental crust: absolute least dense (rock ) material , mostly felsic or andesitic. Mojo- discontinuity: chemical and structural change in rock. Upper is sold; lower is partially molten. Africa continues on a northern path and will collide with eurasia: closing of mediterranean. Subduction of the atlantic seafloor will result in the closing of atlantic basin and colliding of the americas with eurasian-african landmass. 2. 9 additional evidence of plate tectonics: ocean drilling, mantle plumes and hot spots, paleomagnetism. 2. 11 driving force behind plate motion: convection in mantle: whole mantle convection (plume model) Cold oceanic lithosphere sinks to great depths and stirs the entire mantle. The downward flow of these subducting slabs is balanced by buoyantly rising mantle plumes that transport hot mantle rock toward the surface: layer cake model.
