Use the drop down menus to answer the questions. In what type of plate boundary did subduction occur? In what type of plate boundary did new crust form? In what type of plate boundary did mountains form? In what type of plate boundary did volcanoes form? In what type of plate boundary did a river change its path? Use the drop down menus to answer the questions. In what type of plate boundary did subduction occur? In what type of plate boundary did new crust form? In what type of plate boundary did mountains form? In what type of plate boundary did volcanoes form? In what type of plate boundary did a river change its path? Use the drop down menus to answer the questions. In what type of plate boundary did subduction occur? In what type of plate boundary did new crust form? In what type of plate boundary did mountains form? In what type of plate boundary did volcanoes form? In what type of plate boundary did a river change its path?