every 2 years
Yes, they often erupt again.
There are no volcanoes in the Grand Canyon.
Never.
Yes. Composite volcanoes often produce violent eruptions.
they arupt 2 a year
As many as it wants. Some volcanoes erupt often, some infrequently
No. Volcanoes erupt.
About 60 volcanoes erupt each year.
An unlimited amount of volcanoes can erupt at once
Volcanoes can erupt at any time of year.
Volcanoes can erupt in any climate. Climate does not affect a volcano's ability to erupt.
Active volcanoes erupt. Dormant volcanoes are quiet - but may erupt again some day. Extinct volcanoes have "closed up shop" for good, and will never erupt again.