Download Add to Favorites Add to Folder creative writing children's book activities classroom tools language arts and writing vocabulary Create new folderCREATE NEW FOLDER Share In this science printable, students will review how the half-life of radioactive elements can be used to determine a rock's absolute age. Grade: 6 | 7 | 8 | 9 Subjects: Science Earth Science Geology Fossils + show tags TYPE: Worksheets