Book Description: An exciting revision of this innovative text, Earth: Portrait of a Planet, Third Edition, emphasizes active student learning with a new chapter format, interactive media, and the power and insight of Google Earth™. Packaged with the text are worksheets to accompany each chapter’s Geotour—23 in all—and can be assigned as homework assignments and lab activities.These worksheets ask students to make observations and measurements of actual geologic sites in order to better learn important concepts in each chapter. The workbook includes a introductory tutorial on how to use Geotours, a Geotours Guide two-page spread, and a worksheet exercise for each Geotour.