Volcano A erupts rocks with SiO2 content ranging from 49% to 52% whereas volcano B,100km away,erupts materials with SiO2 content of 62-68%.Which statement best characterizes these two volcanos?
A)Both volcanos are shield type volcanos that are characterized by quiescent eruptions.
B)Both volcanos are violent,explosive volcanos that spread ash continent wide.
C)Volcano A is likely to be a supervolcano with violent eruptions,whereas volcano B is probably a shield volcano with quiescent eruptions.
D)Volcano A is probably a shield volcano with typically quiescent eruptions,whereas Volcano B is likely a stratovolcano characterized by violent,explosive eruptions.

Question

Quizplus · Accepted Answer

The SiO2 content of volcano materials can indicate the viscosity and explosiveness of an eruption. Volcano A's SiO2 content range suggests that it is likely a shield volcano with typically quiescent eruptions. Volcano B's SiO2 content range suggests that it is likely a stratovolcano characterized by violent, explosive eruptions.

Volcano a Erupts Rocks with SiO2 Content Ranging from 49