The Big Dig: Bury a variety of materials in the ground. After a few weeks, unearth your treasure and see which items were the most/least biodegradable. Click here for details about this project.
Recycling Greywater: Can Plants Tolerate It? Select two groups of plants growing in the same conditions. Water half with greywater andthe other half with drinking water. Compare the growth and health of the two. Click here for details about this project.