every 100 years roughly
Yes, they often erupt again.
It depends, a volcano can erupt once and never erupt again. Or, a volcano can erupt multiple times a day.
Never.
Very varied. Some erupt every few decades, some are dormant for centuries.
As many as it wants. Some volcanoes erupt often, some infrequently
Mt.vesuvius does errupt often. hope this helped!
Not too often XD :D C===3
normally, only once a year! not very often.
every 2 years
Mount St. Helen does not erupt in any pattern. When it erupted in 1980, scientist had no idea that it was going to erupt because it did not follow a pattern and it did not have very many precursor.
Krakatoa erupts about 14 times a year.
There are no volcanoes in the Grand Canyon.