This document discusses adding new earthquake data to ArcGIS Explorer and changing the display colors of the data layers. It instructs the user to check that two new earthquake data themes are displayed in contrasting colors and, if needed, change the color of the layers by right-clicking on their names in the table of contents and selecting properties. It then asks the user to observe the distribution of the new earthquake data and compare it to other earthquake data, and asks what type of plate boundary is associated with large magnitude earthquakes.