Set aside three of the thirty-second pieces. They represent the land too wet, steep or cold for food crops. The remaining thirty-second piece represents the land suitable for food production. Carefully peel the skin from the last thirty-second piece. This represents the thin layer of topsoil that can support life.
Students divide the pieces equally, eat the whole earth and complete the student worksheet.
This activity is adapted from Green Teacher. Urbanization of agricultural land Protect productive agricultural land from urban development, so that food can be produced close to population centres. Natural disasters Store nonperishable foods like grains for emergency supplies. The higher standard of living almost always results in a lower birth rate. Allow people a choice in limiting their fertility.