The following links provide examples of 'movies' which can be created based on a slide show with backing music.
Remember you need to include facts about the area of study as well as providing an appropriate background music.
Earthquakes
California - http://www.youtube.com/watch?v=5a7OizEdAik&feature=related
China - http://www.youtube.com/watch?v=dX-7JZxAqqY
China - http://www.youtube.com/watch?v=Yep9ndr_4hY&feature=related
Volcanoes
http://www.youtube.com/watch?v=CPcGqtIlYX0
http://www.youtube.com/watch?v=BcFtpWjZwlE&feature=related
Earth Structure & Volcanoes
http://www.youtube.com/watch?v=1uS5KfpgMFQ