This is one of many glaciers that drain off the huge Vatnafjöll volcano, one of Iceland’s most active volcanoes. Glaciers atop volcanoes represent a fascinating—and potentially deadly—combination of fire and ice. Nearly 60 percent of volcanic eruptions in Iceland occur beneath glacial ice, raising the grim specter of a massive glacial flood. As the camera moves in closer you can see the flow off the ice fall as it plunges from a few thousand feet above sea level and pours down over the rock cliffs.

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