Here are a few of the large KMZ/KML files that I have created in Google Earth for you to download and use as foundation files for your own creations. They are:
Blank Polygons of all world countries
One last thing! You may want to click this link for a short cheat sheet of tips, strategies, and shortcuts I’ve picked up over the years for making my work in Google Earth more efficient and more focused. Feel free to print it out and share it with other teachers who might benefit from it. Also, please comment on it and help me make it better! Google Earth Cheat Sheet Google Doc