题目内容

When the melted rock has reached the surface of the Earth, it is called:

A. Magma
B. Lava

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According to the content of SiO2, the magma can be classified into:

A. Ultrabasic magma
Basic magma
C. Intermediate magma
D. Acidic magma

The basic characteristics of magma include:

A. High temperature
B. Complex component
C. Viscous and mobile

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

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

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

A. Intrusive igneous rock
B. Extrusive igneous rock