EARTHSC 2GG3 Lecture 2: Lecture 2 part 3
16 Jan 2019
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Document Summary
Crust is destroyed along other plate edges, subduction zones, the rate of production of new lithosphere at spreading centeres is balanced by consumption of lithosphere at subduction zones. Sinking plates generate earthquakes: sinking ocean plates come on contact with the hot atmosphere, plates melt to generate magma, magma rises to produce volcanoes, earthquakes occur along the path of the descending plate. Plate tectonics is a unifying theory: explains a variety of phenomena, convection within earth"s mantle likely drives plate tectonics. Types of plate boundaries: three basic types, divergent, convergent, and transform, the boundaries are broad zones of intense deformation. Divergent plate boundaries: where two plates move away from one another, new lithosphere is created at these boundaries, divergence btwn two ocean plates, caused mid ocean ridges, seafloor spreading, ex/ mid atlantic ridge.
