Originally these exercises were made as parts of workshops on teaching earth science in high schools and college. Several more were added outside of workshops, so this list represents a variety of materials. Unfortunately, the number of exercises and the rise of XHTML have made it difficult for me to properly maintain each as a web site. I have taken the liberty of converting many of the exercises to .PDF files that will not be further maintained. Many of the original links no longer work, but associated key words will help you to search for similar resources. I hope you find something here of value, and I thank the original writers of these materials for their efforts.