题目内容

The degrees of transparency are:

A. Transparent
B. Translucent
C. Opaque

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The appearance of being coated with an oily substance is called:

A. Vitreous luster
B. Adamantine luster
C. Greasy luster

Which element is the most abundant in the Earth (by weigh)?

A. Si
B. O
C. Al
D. Fe

What rock is the cooling and solidification of magma?

A. Metamorphic rock
B. Igneous rock
C. Sedimentary rock

The driven forces for the formation of metamorphic rocks are:

A. Gravity
B. Heat
C. Pressure