The four-chart set covers key concepts related to core Earth Science topics. Each 18” x 12” chart is double-sided and laminated. One side provides an illustrated overview of the topic, while the reverse features “write-on/wipe-off” graphic organizers, problem-based questions and other review activities. The Rocks, Minerals & Fossils Bulletin Board Chart Set includes the following charts: Geologic Time Scale Minerals Rocks Fossils.