My American Farm - Farmville for Students

The American Farm Bureau Foundation for Agriculture’s My American Farm project teaches agricultural literacy to consumers and the public through an interactive computer game. Players learn where food comes from and how those products get from the farm to their dinner plate. My American Farm is an online educational game that lets students learn about agriculture while having fun.  If you have kids in your grade that thinks milk comes from a carton then this is probably a good starting point and avaialble here.