The red-hot fountains of molten lava, glowing like wildfire, are nothing short of spectacular. Yet they could be ominous portents of things to come.  For the second time in four nail-biting years, seismologists in the land of fire and ice, Iceland, are bracing for a monumental volcanic eruption that, once again, threatens to disrupt European air traffic. Back in 2010, the Eyjafjallajokull volcano, which melted through 200 metres of glacier, sent more than 200 million cubic metres of fine ash billowing almost 10 kilometres into the sky. As a result, several European countries were forced to ground or re-route thousands of flights for several days. This time the threat of an eruption – potentially even more powerful than the one in 2010 – is posed by Bardarbunga, the biggest of Iceland’s 30 or so volcanic systems. Located roughly at the country’s centre, the volcano’s 10-kilometre caldera lies several hundred metres beneath Vatnajokull, Europe’s largest glacier by volume. Full Story