Galaxies and the Universe: This is a pretty complete, but somewhat advanced site to help your students prepare for this event.
OsmoBeaker: This is software you may purchase to help your students prepare for this event.
MedMyst - Medical Mysteries on the Web: This is a good introduction website which takes students through some "Medical Mysteries" to show them how to solve problems in medicine.
Earthquakes: This is a site that has some good introduction material along with short animated clips for many of the concepts in this event.
Digital Geology: This is another good site for an introduction to earthquakes.
Some good volcano sites: South Dakota State University Geology Dept. ; Vulcan ; Links to hazards and weather changes
EcoBeaker : This is software you may purchase to help your students prepare for this event.
Bird Calls: Hear the songs and calls of more than 550 North American birds.