Usage History of 'sinkhole'

The following chart shows how frequently 'sinkhole' appeared in printed materials over time. For example, the word 'sinkhole' occurred 4 times in books in 1810 and 5,629 times in 2008. From 1810 to 2008, the word 'sinkhole' was used a total of 118,023 times in books scanned by Google. See Reference: Google Ngram project.

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