http://video.nationalgeographic.com/video/earthquake-montage
USGS Earthquakes: check here for up-to-the-minute earthquake maps and news, and report earthquake sensations. http://earthquake.usgs.gov/
Measuring Earthquakes FAQ: http://earthquake.usgs.gov/learn/faq/?categoryID=2
FEMA Emergency Planning: be prepared for earthquakes and other natural disasters. http://www.ready.gov/
Great lesson plan on the Richter Scale
http://www.calacademy.org/sites/default/files/assets/docs/pdf/338_measuringearthquakes.pdf
Seismic Monitor: http://ds.iris.edu/seismon/
Interactive lesson on the earthquakes, volcanoes, and fault lines. Explains all four types of movement and shows animations. http://www.bbc.co.uk/schools/gcsebitesize/geography/natural_hazards/tectonic_plates_rev2.shtml
Great slideshare on the theory of continental drift and it’s evidence http://www.slideshare.net/mrzolli/theory-of-continental-drift-whms-12788742
Great summary of the points of the lesson: http://video.nationalgeographic.com/video/101-videos/earthquake-101