题目内容

The volume percentage of igneous rocks in the crust is about:

A. 8%
B. 20%
C. 66%
D. 75%

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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

Igneous rocks vary in :

A. Grains
B. Color

Which mineral is usually used as drilling mud?

A. Hematite
B. Pyrite
C. Barite
D. Gold