Acknowledgements -

Development of the materials in this booklet goes back to 2005 when I first realized that a project I was putting together would benefit greatly from the addition of GIS (geographic information system) interactive maps. During the years since I have had the opportunity to develop my GIS skills participating in a GEODE Initiative curriculum development project at Northwestern University and ESRI T3G workshops in 2011 and 2017. Special thanks goes to ESRI and particularly to K-12 Educational staff members Charlie Fitzpatrick and Joseph Kerski for software support and encouragement.

Fellow T3G participant, Robert Woolner was kind enough to do a critical reading of the text and provide feedback.

Thank you.