Geogrpahy of continents
http://www.youtube.com/watch?v=uGcDed4xVD4&feature=related
stages of water
http://www.youtube.com/watch?v=TJoSuAVUGQA&feature=related
Cause for high and low pressure
Excellent on heat, radiation, rocks, etc
Tides (Simple version)
Tides-Moon formation (more ppt)