Johan "Joop" Varekamp, the Harold T. Stearns Professor of Earth Science, professor of earth and environmental sciences, is the author of two chapters in Volcanic Lakes, published by Springer Science+Business Media, 2015. He worked on the chapters during his sabbatical in Bristol, U.K., in 2013. Varekamp's chapters are titled "The Chemical Composition and Evolution of Volcanic Lakes" and "Volcanic Lakes." Five other authors also contributed to the "Volcanic Lakes" chapter. Volcanic lakes are natural features on the planet. The changing water compositions and colors of these lakes over time provide insights into the volcanic, hydrothermal and degassing processes of the underlying…