1. What type of magma contains 45-55 wt% of Sio, and has a high Fe,
Mg, Ca and low in K and Na?
A Basaltic magma
C Rhyolitic magma
B. Andesitic magma
D. all of the above
2. The following are metallic components of rhyolitic magma, except.
A. Fe and Mg
C. K and Na
B. Mg and Ca
D. Na and Hg
3. The following are composition of gases in magma, exept.
A. Water vapor
B Carbon dioxide
C. minor amounts of sulfur, chlorine and fluorine gases
D. Mostly oxygen
4. What is the eruption temperature of Rhyolitic magma?
A 1000 to 1200 °C
C. 600 to 700 °C
B 800 to 1000 °C
D. 650 to 80 °C
5. What is the viscosity of magma if the temperature is high?
A. Higher viscosity
C. lower viscosity
B. Moderate
viscosity
D. all of the above
6. What is the viscosity of magma if it has a higher SiO silica content
A Higher
viscosity
C. lower temperature
B Moderate
viscosity
D. all of the above
Til is an important property of magma that determine the eruptive
Vior of magma.
A Tenperature
C. phase
Viscosity
D. all of the above


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