Activity 2: Create and Interpret Using Graphs & Cross Sections
Activity: Students plot earthquake foci on a series of cross sections, then answer a set of questions prompting them to tie observations to interpretations.

Concepts: Figure 13. One of four blank cross section give to students. (Chile trench, Mid-Atlantic Ridge, India-Asia convergent margin, and San Andreas fault). Figure 14. Students will plot earthquake foci on the cross section using figures A and C to guide them. Figure 15. Subsurface structure, printed on transparency, is given to the students, which they will overlay on their cross section.