Three separate, aerated compartments enable kids to view the entire decomposition process clearly and make side-by-side comparisons between different materials. Details:12" x 4" x 8" clear plastic box with faux grass top, 3 clear-view compartments with aeration holes and magnification spots, and thermometersIncluded thermometers demonstrate temperature changes during decomposition processAges 5+/Grades K+Teaches decomposition, composting, life cycles, and environmental educationTeacher's guide with usage ideas, time lines, and science fair applications