Question

how you are welcome classified based on the preiodicity of their eruption?​

Answer 1

Explanation:

On the basis of their periodicity of eruptions, volcanoes may be classified into active, dormant and extinct volcanoes.

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Answer 2

Explanation:

On the basis of their periodicity of eruptions, volcanoes may be classified into active, dormant and extinct volcanoes..........

Notable precursors to an eruption might include:

An increase in the frequency and intensity of felt earthquakes. Noticeable steaming or fumarolic activity and new or enlarged areas of hot ground. Subtle swelling of the ground surface. Small changes in heat flow.