Just how biodegradable is our garbage? Use this timely kit to perform four investigations of the degradation processes that occur in a landfill. Students can build three simulated landfills, then test the microbial degrading process and study the types of naturally occurring bacteria in different soils. The data from the tests can be used to define the biodegradability of materials and to study the function of landfills. Includes a teacher’s guide. Grades 9–12.