According to the content of SiO2, the magma can be classified into:
A. Ultrabasic magma
Basic magma
C. Intermediate magma
D. Acidic magma
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The basic characteristics of magma include:
A. High temperature
B. Complex component
C. Viscous and mobile
The volume percentage of igneous rocks in the crust is about:
A. 8%
B. 20%
C. 66%
D. 75%
Most magma never reaches the surface. Rather it crystallizes at depth to produce:
A. Intrusive igneous rock
B. Extrusive igneous rock
Molten rock (magma) originates in the:
A. Crust
B. Mantle
C. Outer core
D. Inner core
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