Using the cross-section of south america, describe the pattern of earthquake depth from west to east along line ab. 2. based on your answer to question 1, what appears to happen as the ocean plate to the west collides with the continental plate to the east? 3. referring to a world map, what surface feature on the west coast of south america has apparently formed as a result of collision of two crustal plates? 4. according to your data chart and the tectonic plates map, where are most divergent plate boundaries found? 5. referring to procedure c, what type of plate boundary is the san andreas fault? 6. at which type of plate boundary would a subduction zone be found? 7. at which type of plate boundary is new oceanic crust created? 8. oceanic trenches are associated with which type of plate boundary?