What Are the Criteria Used by Geologists to Give a Semiquantitative

Multiple Choice

What are the criteria used by geologists to give a semiquantitative measure of the size of an eruption?

A) number of deaths caused by the eruption and the number of buildings destroyed
B) volume of material erupted and height of the eruption plume
C) size of the pre-erupted volcano and the type
D) temperature and pressure during eruption
E) sizes of pyroclastic materials ejected and the distances they travel from the volcano