There is no volcanic ash cloud over Europe today, and forecasts from Britain's Meteorological Office show clear skies all week. The Iceland volcano, Eyjafjallajökull, is shrinking and now appears dormant.
Every time in recorded history that Eyjafjallajökull volcano has erupted, the much larger Katla volcano has also erupted. Scientists are watching Katla carefully.
Ash from Eyjafjallajokull, the Iceland volcano that erupted this week, has caused airlines to cancel thousands of flights. Scientists say the chemical makeup and shape of the ash cloud's dust particles will tell them more.
Scientists say history has proven that when the Eyjafjallajokull volcano erupts the Katla volcano erupts too.
No immediate reports of injuries or damages from Iceland volcano eruption but scientists worry of larger eruption at nearby Katla volcano.