1
The interior of the structure consists of volcanic ash.
2
The bubbly or frothy appearance is due to bentonite, or volcanic ash.
3
The volcanic group lies on the Kurile arc of the Pacific ring of fire.
4
The channel is the result of volcanic activity.
5
The volcanic eruption was the source of the catastrophe.
6
A contingency planning is needed for volcanic eruption.
7
The region was also the site of periodic volcanism.
8
These are the spatiotemporal patterns of seismic and volcanic activity.
9
The chasm became the volcanic rent of Mount Tarawera.
10
The forearc lies between the trench and the volcanic arc.