PowerPoint used in the first lesson
http://www.slideshare.net/reservoirgeogs/depressions-presentation
Animations of Fronts
http://www.mesoscale.iastate.edu/agron206/animations/05_cnWfronts.html
Global Atmospheric Circulation
http://www3.interscience.wiley.com:8100/legacy/college/strahler/0471238007/animations/ch07_animations/animation3.html