Review game:
participate in the "soil conservation" game according to this general scheme:
1. form teams of reasonable size
2. Teams prepare response cards (A-D and color)
3. each team starts out with 12 area units of soil
4. each team answers every question on the powerpoint
5. wrong answers result in 'soil erosion', and the team loses one area of soil for each
6. top teams in soil retention get extra participation points