A field course attended by science teachers in California's Owens Valley incorporated geospatial technology to reinforce the relationship between elevation, aspect, or the direction a mountain slope faces, and vegetation. Teachers were provided GPS units to record locations and plant communities throughout the 9-day field course. At the end of the field course, they completed an exercise utilizing ArcGIS and/or Google Earth. A similar essay question about vegetation and elevation was answered at the beginning of the course and after the GIS/Google Earth exercise. Scores on this pre- and postactivity question as well as responses to a survey questionnaire indicate that GIS and Google Earth both helped the teachers understand how elevation influences vegetation. The role of aspect was not as well demonstrated in the post-test responses as that of elevation. Teachers reported being more likely to use Google Earth in their classrooms than GIS (75% to 58.3%). Combined with GPS, Google Earth provides a free, easy and flexible way to teach a number of earth science concepts and meet several National Geography Standards.