The map to the right, generated by the Pollen Viewer tool, shows the distribution of Alder trees (gray to green shades) and ice (light blue) across North America 21,000 years ago. The complete time series of maps across 21,000 years and for over 40 plant species are available in the Pollen Viewer tool.
This chapter is part of the Earth Exploration Toolbook. Each chapter provides teachers and/or students with direct practice for using scientific tools to analyze Earth science data. Students should begin on the Case Study page.
The EET web site collects no personally identifying information and so is compliant with the Children's Online Privacy Protection Act. The site is constructed with tools that attempt to ensure the broadest possible accessibility in line with section 508 and w3c guidelines.