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One important source of fluoride in earth's fluoride cycle is volcanoes! This is Augustine Volcano in January 2006. Augustine Volcano is an island volcano in Alaska and is one of the volcanoes that the Alaska Volcano Observatory keeps tabs on. Credit: U.S Geological Survey, Game McGimsey.

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Hi, we're Effie & Kylie. We are scientists. We are moms. We are from Portland, OR. And we founded this site to bring you real science about water, health, and teeth. More...

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