题目内容

Molten rock (magma) originates in the:

A. Crust
B. Mantle
C. Outer core
D. Inner core

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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

Biotite is the common member of the mica family. It belongs to:

A. Light silicate
B. Dark silicate
C. Nonsilicate