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Geology 101, Fall 2006
Assignment 6: Plate tectonics
Define/distinguish the following terms:
continental drift vs. plate tectonics
active contintental margin vs. passive continental margin
continental shield vs. craton
Draw one cross-section of the Earth that shows all of the following features:
• a mid-ocean ridge
• a trench
• an accretionary wedge (mélange zone)
• a volcanic arc
• a forearc basin
• a backarc basin
Name an accreted terrane (microcontinent) that makes up part of Washington.
What are the four lines of evidence that Alfred Wegener cited as evidence of
continental drift?
Even though hotspot volcanoes have little to do with plate tectonics, explain how
hotspot volcanoes were critical in providing evidence for plate tectonics.
What continents came together to form Pangaea? What continents resulted when
Pangaea broke up? From when to when did Pangaea last, anyway?
What does an ophiolite sequence (ophiolite suite) represent?
Name four mechanisms by which plates may be made to move around the
surface of the Earth.