Smoke billows from a volcano in Eyjafjallajokull on April 16. Iceland’s second volcano eruption in less than a month has sent plumes of ash and smoke billowing more than 20,000 feet (6,000 metres) into the sky. The massive ash cloud is gradually sweeping across Europe and forcing the continent’s biggest air travel shutdown since World War II. AFP / Getty Images / Halldor Klobeins
