Not only the largest be the only volcano to erupt in the U.S. mainland in the past 50 years was Mount St. Helens.
It is impossible to predict when a volcano will next erupt.
An active volcano is one that is erupting or is likely to erupt.A dormant volcano is one that has not erupted for a long time (but is still possibly active).An extinct volcano is one that is not likely to erupt again.
The volcano is said to be extinct if it hasn't erupted for at least 10,000 years.
About 4,500 years ago
There is no fixed length to an erruption, it varies from volcano to volcano. a volcano can erupt in days or more than its depend on its manner .
When a volcano is active it will erupt. These volcanoes might take many years to erupt but will still erupt.
It is impossible to predict when a volcano will next erupt.
Maka wahu
Mauna Loa is the world's largest active volcano. It's last eruption was in 1984. There is a 100% chance that it will erupt again within the next five years.
mayon volcano
An active volcano is one that is erupting or is likely to erupt.A dormant volcano is one that has not erupted for a long time (but is still possibly active).An extinct volcano is one that is not likely to erupt again.
The volcano is said to be extinct if it hasn't erupted for at least 10,000 years.
millions of years ago
About 4,500 years ago
That volcano is likely to erupt again. Every volcano is different ,research on the volcano and when was the last time it erupted and then add 500 to 1000 years.
An extinct volcano has not had an eruption for at least 10,000 years and is not expected to erupt again in a comparable time scale of the future.This is in contract to a dormant volcano, which is an active volcano that is not erupting, but supposed to erupt again. An active volcano is a volcano that has had at least one eruption during the past 10,000 years. An active volcano might be erupting or dormant.
every 100 years roughly