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