Annotation of: Retreat of the Laurentide Ice Sheet (Catalog title)

This resource is used in the Global Ups & Downs: Changing Sea Level Teaching Box, Lesson 3, activity 3: "North American Glaciation". It is used as a visual to show the changes in the extent of the ice sheet from 18 thousand to 8 thousand years ago. The resource being annotated is: http://www.dlese.org/dds/catalog_DLESE-000-000-008-851.htm