Question

A group of scientists is investigating the site of an ancient volcanic eruption. How can scientists determine whether more than one eruption occurred?
Responses
A by analyzing the order in which the different layers of ash emerged from the volcanoby analyzing the order in which the different layers of ash emerged from the volcano
B by finding the distance of the ash deposits from the volcanoby finding the distance of the ash deposits from the volcano
C by measuring the thickness of the ash depositsby measuring the thickness of the ash deposits
D by dating the ash depositsby dating the ash deposits

Answer 1

A. by analyzing the order in which the different layers of ash emerged from the volcano

Distinct ash layers stacked one on another indicate separate eruptive events (principle of superposition). Radiometric dating of layers can give absolute ages, but observing multiple separate layers is the direct evidence for more than one eruption.