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Year
Answer
This Icelandic resulted in massive impacts on air travel worldwide. Over 100,000 flights were cancelled over that week, affecting 7 million passengers
2010
Mt.Eyjafjallajökull
It caused the year without summer
1815
Mt Tambora
The eruption, which had a volcanic explosivity index of 5, was the first to occur in the contiguous United States since the much smaller 1915 eruption of Lassen Peak in California.
1980
Mt St Helens
Destroyed Pompeii
79
Mt Vesuvius
Second most deadliest eruption in recorded history