Hello astrogeek , there is a slackbuild for the last 6.x version,
but I don't know if the link for GoogleEarth is the 6.x or 7.x version.
I have a txz package of that version (googleearth-18.104.22.1687-i386-1sl.txz)
because on my machine it is the only version that works (maybe due to lack of SSE2).
Sorry but I don't remember where I downloaded that version, I'm using it since Slackware 13.37.
If you want I can post it somewhere for download (23.1MB)
Edit - After some Google Search for Google Earth
I think this is the very place where I downloaded