American Geosciences Institute
American Geosciences Institute: Earth Science Week: Exploring Color Maps
An activity where students study the Ozone Hole poster used that brings together colorful images of over 30 years of satellite observations of the ozone hole. Students interpret the color on the globes to see how the ozone hole has...
Digital Public Library of America
Dpla: Manifest Destiny
From twentieth-century posters, monuments, and letters to nineteenth-century maps, biographies, and paintings, this set allows students to gain a greater understanding of how perceptions of manifest destiny have changed over time.