Geography
How Volcanic Eruptions Spread Ash Across Continents
Quick fact
Ash from the 1991 Mount Pinatubo eruption in the Philippines circled the globe in just 22 days, affecting weather patterns worldwide.
Why this is interesting
The 2010 eruption of Eyjafjallajökull in Iceland grounded flights across Europe—how did ash from a single volcano reach skies over Germany, France, and the UK?