Google will treat some "long tail" keyword searches on new sites as "news" because it is fresh content. As with all news stories, they gradually fade to the back pages.
Once your site has been around for awhile as per my previous reply, the results would usually stay around and not fade - although some new fresh content on competitors blogs and the like may contend with you for a while until they too fade - but yours would stay in relatively the same place.
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