I'm finding some strange query strings on my homepage are indexed in Google and causing duplicate content. A couple of examples: https://sciencetrends.com/page/103/?cat=-1 https://sciencetrends.com/?cat=-3

I'm not sure how or why these pages are being created in Wordpress but it seems common for even large Wordpress sites: https://techcrunch.com/page/10/?cat=-1 https://blogs.wsj.com/law/page/10/?cat=-1 https://www.nytco.com/page/10/?cat=-1 http://www.bbcamerica.com/page/10/?cat=-1

Ideally, I'd like to remove all ?cat=* pages from the site and have then resolve to 404. Any thoughts on the best method to do so, .htaccess, Wordpress modification, etc.?

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