sunspots http://earthobservatory.nasa.gov/Library/SolarMax/solarmax_2html.
images from Hubble Space Telescope http://hubble.nasa.gov/
colliding galaxies http://www.nasa.gov/missions/science/f_chandra010703.html
practice for math facts/also a good site to study the 50 states http://www.aaamath.com
many topics, but I checked the LA - the 6th grade level seems better to me http://www.internet4classrooms.com/skills_6th_original.htm
This is for your Canadian webquest. When you go to the site look on the right for a tab that says World Factbook. Click on that and then click on Canada. The quest is in the same order as the information. http://www.cia.gov