Volcano challenges scientists

Lava is flowing from Iceland's Eyjafjallajokull volcano as the eruption enters a new stage.

Although the plumes are smaller than the ones that emptied the airspace over Europe over the past week, they are still a threat.

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.

However, as Al Jazeera's David Chater reports from Iceland, scientists there cannot predict what will happen next. (20 April 2010)