This website from PBS provides information about the plate tectonics, the theory that the Earth's outer layer is made up of plates, which have moved throughout time. The four types of plate boundaries are described and illustrated with animations. The first page of plate tectonics also provides a plate tectonics activity and information about related people and discoveries.
%0 Electronic Source %D 1998 %T Intro to Plate Tectonic Theory %I Public Broadcasting Service %V 2015 %N 28 March 2015 %9 text/html %U http://www.pbs.org/wgbh/aso/tryit/tectonics/intro.html
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