There are no such things as "stupid" questions. However if you think your question is a bit stupid, then this is the right place for you to post it. Please stick to easy to-the-point questions that you feel people can answer fast. For long and complicated questions prefer the other forums within the support section. Before you post please read how to get help
This is not a bug but a problem with the graphics capabilities of your machine. Ticking the Safe Grahics Mode option and reducing the colour setting goes some way to alleviating this flickering. Also mint does not maintain google earth, you would need to report the problem to google.
[Edit] your original post and add [SOLVED] once your question is resolved.
“The people are my God” stressing the factor determining man’s destiny lies within man not in anything outside man, and thereby defining man as the dominator and remoulder of the world.
Or do as I have done and turn Compiz off via the Appearance settings - click on the tab 'visual settings' and then tick 'none'. Forget about the unnecessary desktop effects! Everything works nice and smoothly without Compiz. Apparently there's a problem with OpenGL applications such as Google Earth working with Compiz. Just type in 'Compiz Google Earth ubuntu' into Google search and you will find some info on this. Also worth turning off the 'atmosphere' feature (via the 'View' menu) in Google Earth and this will help it work nicely. I didn't bother fiddling with any other settings in Google Earth.