I found this activity a while ago in a book and have modified the worksheet to suit my teaching style. This activity takes 2-one hour periods (this time includes conclusion questions) and investigates how quickly nonrenewable resources will be depleted at the rate at which we are using them. The only materials that you need are pinto beans (100 per team) and white beans (10 per team). The data collection is important for them to draw conclusions. Enjoy!