I spent quite a bit of time looking over this, trying to decide whether or not I would list it. The site hasn’t been updated since 2004, but the information is all gathered in one place and for the most part is still pertinent. Some of it says to use Netscape, but you don’t have to in order to do the activities. They’re basically Project Based Learning Modules that you can use in your classroom. I thought I would list them and then let you decide how to use them. Several different topics are covered. I’m already thinking about using the one on volcanoes to get some critical thinking skills going.
If you use it and like it, let me know? I may end up listing the mods separately if I think it would get used more that way.