In this lesson, a girl wonders how volcanic rocks and sedimentary rocks ended up in the same area of the Upper Peninsula of Michigan. Key words and concepts covered are rock cycle, formation of rocks, plate tectonics, divergent margin, and rift zone. Crosscutting concepts explored are patterns, cause and effect, systems and system models, and energy and matter. This book selection includes the Table of Contents, Preface, Catalog of Problems, Acknowledgments, About the Authors, and Index.