Some card will need to be taped in place. A thin layer of petroleum jelly should now be spread over one side of each card. Brainstorm possible places to hang these cards. As a whole class, rotate throughout the school yard, classroom and school building, placing cards a appropriate locations. Teams should record the location and date for each of their cards.
Older students can describe the condition of each location and predict the outcome for each.
The the duration of this activity is approximately 1 week.