Volcano challenges scientists

Lava is flowing from Iceland's Eyjafjallajokull volcano as the eruption enters a new stage.<br /><br />Although the plumes are smaller than the ones that emptied the airspace over Europe over the past week, they are still a threat.<br /><br />In the department of geophysics at Rekjavik University in Iceland, volcanologists and seismologists pour over data from the volcano, trying to work out what it all means.<br /><br />However, as Al Jazeera's David Chater reports from Iceland, scientists there cannot predict what will happen next. (20 April 2010)