Usage History of 'felsic'

The following chart shows how frequently 'felsic' appeared in printed materials over time. For example, the word 'felsic' occurred 2 times in books in 1870 and 3,705 times in 2008. From 1870 to 2008, the word 'felsic' was used a total of 137,120 times in books scanned by Google. See Reference: Google Ngram project.

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