Teaching ideas for stress, strain and other geologic concepts

I really like this sight because it is full of teaching ideas – ways that you can explain concepts, demonstrations you can use, and the thinking behind them.  I believe it is aimed a college level teaching, but a lot of it would be useful for younger students as well.  I haven’t had time to check out all the different links on the sidebar, but this page alone is full of good stuff.

http://serc.carleton.edu/quantskills/methods/quantlit/stressandstrain.html