题目内容

Most magma never reaches the surface. Rather it crystallizes at depth to produce:

A. Intrusive igneous rock
B. Extrusive igneous rock

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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

How many percents do nonsilicate minerals approximately make up of Earth’s crust?

A. 8
B. 45
C. 62
D. 90