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I've looked at a few of these and the vast majority of the terms are suggestions by Google but they are things that you wouldn't make up yourself. Its as though Google has tried to read the whole of the web into a huge pyramid and has put at its foundation millions of multi word search terms that only a computer program would think of.
This is the start of the third week of unusually low conversion for me
Bounce rates can be high if the user finds all the information on the page they sought and just clicked out. However bounce rate may play a factor if the user clicked back to search results and then clicked on another site because they did not find the info they were seeking