Hot and Steamy: Beautiful Volcano Lakes Hold Data Trove and Potential Danger [Slide Show]

SANTA ANA VOLCANO, EL SALVADOR Image: Courtesy Robert Simmon based on data provided by Timothy Gubbels and Asad Ullah/SSAI/NASA/GSFC/METI/ERSDAC/JAROS and U.S./Japan ASTER Science Team

Only 12 percent of the world's active volcanoes are topped with lakes. Scientists study these lakes' chemistry to monitor and learn more about volcanic activity. Whereas the lakes are rare and beautiful, they can also be dangerous. Those atop active vents can bubble and overflow during an eruption, spilling boiling water down the volcano's slopes.

? Click here for a slide show of lakes atop volcanoes

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