http://oceanexplorer.noaa.gov/facts/plate-boundaries.html
http://www.learner.org/interactives/dynamicearth/plate.html
http://www.learner.org/interactives/dynamicearth/drift.html
http://www.cotf.edu/ete/modules/msese/earthsysFlr/plates1.html
http://www.livescience.com/37706-what-is-plate-tectonics.html
http://en.wikipedia.org/wiki/Gondwana
http://www.learner.org/interactives/dynamicearth/plate.html
http://www.learner.org/interactives/dynamicearth/drift.html
http://www.cotf.edu/ete/modules/msese/earthsysFlr/plates1.html
http://www.livescience.com/37706-what-is-plate-tectonics.html
http://en.wikipedia.org/wiki/Gondwana