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The effects of the Mount Tambora eruption of 1815 were felt worldwide.
For the 21st century, that would be Mount Merapi in Indonesia in 2010 so far.
The largest eruption in recorded history was produced by Mount Tambora in 1815. Note, though, that far larger eruptions have occurred in prehistoric time.
actually it happened in 79 A.D.
The 1631 eruption of Mount Vesuvius lasted for a few days. Reports of time suggest from 2 or 3 days to 4 or 5 days, after which the volcano was only about one third its former altitude. Links can be found below.
Yes, far more explosive. The eruption of Krakatoa was more than 10 times larger than the 1980 eruption of Mount St Helens.
The 1980 eruption of Mount St. Helens did not produce lava flows. It was an explosive eruption that prudiced an ash plume and pyroclastic flows. Pyroclastic flows are avalanche-like masses of superheated ash, rock, and gas. Pyroclastic flows from the initial lateral plast reached as far as 19 miles. Ash blown high into the atmosphere was carried by the wind for thousands of miles.
The best way to survive a pyroclastic eruption is to get far from the volcano, beyond the reach of pyroclastic flows. Stay away from stream channels to avoid mudflows. If you experience heavy ashfall, breath through a wet rag.
The eruption of Nevado del Ruiz was far worse. While the eruption of Mount St. Helens was far larger, its worst effects were limited to mostly unpopulated areas, and many of the people who did live in the immediate vicinity had been evacuated beforehand. In ally, 57 people died. The eruption of Nevado del Ruiz was relatively small, but the resulting mudflows killed more than 23,000 people.
Erik WeihenmayerErik Weihenmayer was the first blind person to reach the summit of Mount Everest, on May 25, 2001.
Mount Pinatubo is currently 1,485 m (4,872 ft). However before the 1991 eruption it was a lot higher at 1,745 m (5,725 ft)
Surprisingly, it was not all that powerful as far as eruptions go. It was a VEI 3, about 50 times smaller than the 1980 eruption of Mount St. Helens. However, there was enough hot ash to melt part of the summit snowpack, which created devastating mudflows.