CNN
A volcano in Iceland had been dormant for more than 180 years. But then a few weeks ago, this started. The volcano is erupting, and some scientists say it could last for more than a year. That's about how long it went the last time this happened, that was back in the 1820s. This time, the impact is being felt all across Europe. More than half a dozen countries cancelled flights yesterday. Up to 6,000 total across the European continent. The problem is ash. When the volcano erupted, it sent this huge cloud of smoke and ash high up into the air. If a jet were to fly through that, it could cause the plane's engines to shut down.