Three aerated compartments enable kids to view the entire decomposition process clearly and make side-by-side comparisons among different materials. A great way to teach decomposition, composting, life cycles, and environmental education. Includes a 5.25D x 13W x 8H clear plastic box with faux grass top and aeration holes, 3 clear-view compartments with magnification spots, and thermometers to chart temperature changes. Teacher's guide included. Grade K+.