Tectonics NOTES page 6. Plate Tectonics. ©Mark Place, 2009-2010 www.LearnEarthScience.com. What is the Theory of Continental Drift?. What is the Theory of Continental Drift?. Alfred Wegner, 1915 The continents were once a super-continent called Pangea
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grained, felsic, igneous
High density, dark-
mafic igneous rock
What are the key
characteristics for each?
Give an example of where each can be found.
trenches, volcanoes, deep earthquakes
slide past one another
San Andreas Fault
new crust is made
Explain how magnetic data can be used to show that oceanic crust is diverging at ridges. Use the diagram below to help explain your answer.