While looking for information about the layers of the atmosphere, I found a nice pdf file from the McAuliffe-Shepard Discovery Center in New Hampshire. You can follow the link and print out the activity sheet. Teacher notes and further recommended sites are included. Use it to reinforce Cycle 2, Week 19, Science memory work. http://www.starhop.com/library/pdf/studyguide/elementary/brsp-4layers.pdf