Our Rock Cycle books are designed for students who can read at a minimum 4th grade level. Collecting and learning about the rocks that cover the surface of the Earth is a fascinating subject for all students.Myrna Martin's activity-based Rock Cycle books are easier to use than any other Earth Science program available. They are designed for students interested in learning how to identify rocks and minerals. Each chapter contains written information and a fun science activity. Your students will look forward to their science lessons when they know each lesson includes an activity.