Hand-drawn figure. Label: Cross section along the Aleutian Trench. Top horizontal line marks Sea Level. Then Meg depicts the Pacific Plate to the left subducting (sliding down) underneath the North American Plate on the right. Layers of the plates are labeled Oceanic Crust, Lithosphere, Asthenosphere. A volcano is drawn close to the subduction zone, forming the Aleutian Islands where it reaches above sea level.