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One of Iceland's biggest volcanoes is preparing to erupt, and experts warn the ensuing ash cloud could cause travel chaos across Europe.
The 6,590ft Bardarbunga volcano, which is hidden under the ice cap of the Vatnajokull glacier, has been hit by a series of earthquakes in recent days, measuring 3.9, 3.2, 4.7 and 4.7 on the Richter scale.
Now scientists are warning that pressure inside the volcano's magma chamber is increasing, suggesting it could erupt within the next few years.