Question

what is volcanic activity ?

Answer 1

It is an Opening in the earth Crust from which molten lava, rock Fragments , Ashes , Gases and dust are ejected from the earth surface .
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Answer 2

1)The type of volcanic eruption Is often labeled with the name of a well-known volcano where characteristic behavior is similar--hence the use of such terms as "Strombolian,2)During an episode of activity, a volcano commonly displays a distinctive pattern of behavior. Some mild eruptions merely discharge steam and other gases, whereas other eruptions quietly extrude quantities of lava.
3)The most powerful eruptions are called "plinian" and involve the explosive ejection of relatively viscous lava.