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The Jokulsarlon glacial lagoon at the foot of the Oraefajokull volcano on Thursday, Nov. 30, 2017. The Oraefajokull volcano, dormant since its last eruption in 1727-1728, has seen a recent increase in seismic activity and geothermal water leakage that has worried scientists. With the snow hole on Iceland’s highest peak deepening 18 inches (45 centimeters) each day, authorities have raised the volcano’s alert safety code to yellow. (AP Photo/David Keyton)