Dashed lines show the inferred location of the front edge of each glacier in 1948, 1964, and 1980. Solid lines show the location of the front edge of each glacier in 1998. Points A and B show the location of the front edge of the Taku Glacier in 1948 and 1998. Elevations are in feet. 1. Determine the rate, in miles per year, that the front edge of the Taku Glacier moved between point A and point B. 2. What is the contour interval on this map? 3. If these glaciers completely melted, what two pieces of evidence would a scientist most likely find to indicate that glaciers had existed in this area?