THE MAPS AND THE WORKSHEET

Notice that the axes are different for the two maps (PRE and POST) and the contour profile worksheet. The maps have latitude on the vertical y-axis, whereas the worksheet has depth on the y-axis.
Both the maps and the worksheet have longitude on the horizontal x-axis and they are the same size so that they can be overlain on each other. We are going to transfer depth information from the maps along a single east-west line of latitude onto a vertical cross section on the profile worksheet to look for changes in depth due to the lava eruption.