Volcanologist Interview Question:

Do you know how many volcanoes erupt every year?

Submitted by: Muhammad

The volcanic explosivity index is a scale from 1 to 8 to measure the magnitude (erupted volume) and intensity
(eruption column height) of an eruption.
The VEI is not used to describe eruptions of lava which are non explosive.
Ancient eruptions are determined by the volume of deposits.
Modern eruptions are determined by the observed column height.
Submitted by: Muhammad