My favorite teacher websites to beg, borrow, steal from? MY WEBSITE (check out review links): http://nhs-nvusd-ca.schoolloop.com/cms/page_view?d=x&piid=&vpid=1316679699106 Bodas -- http://teachers.sduhsd.k12.ca.us/bbodas/welcome_to_ap_environmental_scie.htm And lots more APES teacher's websites! http://www.lcusd.org/lchs/mewoldsen/APES/APESTeachersWebsites.htm And this Virtual Ballooning website lesson (gave you the lab handout): http://www.windows2universe.org/earth/Atmosphere/balloon_atmostrata.html