Geography
How Do Volcanic Eruptions Spread Ash Across Continents?
Quick fact
In 2010, Eyjafjallajökull's ash cloud disrupted over 100,000 flights across Europe — even though the volcano's ash was mostly fine particles that traveled thousands of kilometers.
Why this is interesting
How can a volcano in Iceland darken skies over Europe, and one in Indonesia change weather worldwide? The answer lies in a powerful conveyor belt high above you.