4_plate tectonics2010 - The idea of continental drift has...

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The idea of continental drift has been around for at least a century, but was not accepted. Explain (a) the lines of evidence for continental drift and (b) why it was not believable. (c) Describe the new lines of evidence that now support the unified theory of plate tectonics.
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Thurman Fig. 3-14b
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Thurman Fig. 3-18
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How plate tectonics explains Wegeners continental drift…. Divergent boundaries Transform faults Convergent boundaries Breakup of Pangaea
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3 fundamental plate boundaries 1. Divergent Boundaries : Spreading centers. Creation of new ocean crust. 1. Convergent Boundaries : Subduction zones. Destruction of ocean crust. 1. Transform Boundaries or Faults: Plates slide past each other, no destruction or production. Thurman Fig. 3-20
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Thurman Fig. 3-24
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Rift
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Most divergent boundaries are at mid- ocean ridge (MOR) systems. Mantle upwelling expands crust to form submarine mountain range. Molten rock (basalt) seeps from mantle through cracks to sea floor.
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