Volcano a Erupts Rocks with SiO2 Content Ranging from 49

question 7

Multiple Choice

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.

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