Richard Byrne just posted about a neat BBC interactive on rocks. I was pretty impressed, because it had subtitles and was relatively accessible to English Language Learners. So I explored the site a little further and found that the BBC Schools Bitesize KS3 site had a whole series of similarly accessible activities.
First, go to their main Science page. Next, click on any of the four primary categories:
Organisms, behaviour and health
Chemical and material behaviour
Energy, electricity and forces
The environment, the Earth and the universe
Each of these four sections has multiple “activities,” which are animated exercises that have audio and subtitles.
This site will certainly be on the Best Science Sites list for 2011.
You might also want to check out The Best Science Websites — 2010.