Instead of just opening Google Earth and browsing for tours about or related to plate tectonics I went to Google and searched according to file type. The file types supported in Google Earth and KML and KMZ, but KML is more commonly used. So to conduct the search I entered plate tectonics filetype:kml You can also accomplish the same thing by opening the advanced search menu in Google and selecting KML from the filetype menu. In the video that is embedded below I demonstrate both methods of searching for Google Earth files.
You can learn more search strategies and how to teach them in my on-demand webinar, Ten Search Strategies Students Need to Know.