Stories in Stone Kevin cuff For grades 4-9, this earth science unit deepens understanding of the main processes that lead to the formation of igneous, sedimentary, and metaphoric rocks. Activities include working with rock and mineral samples, investigating the differences between rocks and minerals, and classifying mystery rocks. A crystallization experiment illustrates processes in the formation of igneous rocks. A unique hands-on insight into the rock cycle and plate tectonics, Stories in Stone comes with a complete list of resources and background information.