This page by the US National Snow and Ice Data Center gives access to 14 pairs of glacier pictures showing the loss of ice over time. (You need to scroll down the page, click the box titled, “Long-Term Change Photograph Pairs;” then scroll to the bottom of the page and click “submit.”)

Activities: Print out the glacier pair photographs. Put the dates on the backs. Have students match the photos by noting topographical features, shapes of landmarks, etc. Using the website, identify where the glaciers are located and mark them on a world map. Discuss what strategies they used to match them. Compare areas to historical records of climate and temperature of the areas during the period of time when the photos were taken.

Link.