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Iceland's most active volcano, Grimsvotn, has started erupting, scientists say. The volcano, which lies under the Vatnajokull glacier in south-east Iceland, last erupted in 2004. In 2010, plumes of ash from Iceland's Eyjafjallajokull volcano caused weeks of air travel chaos across Europe.
Iceland is a volcanic hot spot on the Mid-Atlantic Ridge - the dividing line between the Eurasian and North American continental plates. The country's three major volcanoes - Hekla, Katla and Grimsvotn - lie along this boundary. Altogether there are 35 active volcanoes on and around the island.