Grades 9-12. All Kits include: a notebook with instructions and helpful teaching tips, accessories like magnifiers, magnets, streak plates and a storage container. Rock Detective Rolling Kits come in 2 sizes: 50 mysteries and 75 mysteries and include everything you need for a class of 50 students: 50 (75) "mysteries", 75+ (100+), sample rocks, fossils and minerals. As students investigate and solve the "mysteries" contained in the Rock Detective Kits, they will discover for themselves a multitude of earth science concepts. The freedom to move from desk to desk and to share ideas greatly enhances the learning experience. Rock Detective Mysteries exceed the National Science Council's recommended Content Standards for National Science Education.