This is an interesting collection of cases describing the use of Google Earth and KML. The research question is not really defined, but the authors describe the applications in a clear and attractive way. The change of landscapes over time, the use of level of Detail and dynamic views are well illustrated. In this case, the presentation, the images and animations are crucial to distinguish and experience the work. As the paper does not discuss technical details, this may be a weakness of the approach: the reader would like to know more about the differences in content and impact between the cases described here and those described in earlier dynamic modelling work. And the reader would still need to know more about the underlying research question.