题目内容

Typical components of a volcano include:

A. Volcanic cone
B. Crater
Caldera
D. Vent
E. Magma chamber

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The most common optical properties we discussed in the class include:

A. color
B. streak
C. hardness
D. fracture
E. luster
F. transparency

How many percentages do the nonsilicates make up approximately of Earth’s crust

A. 2
B. 8
C. 33
D. 76

The biotite belongs to:

A. Light silicate
B. Dark silicate

The feldspars group belong to:

A. Light silicate
B. Dark silicate