题目内容

According to the depth from the surface of the Earth to the top point of the intrusive body, the intrusive rocks can be classified into:

A. Plutonic rocks
B. hypabyssal rocks
C. extrusive rocks

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According to their periodicity and activity, volcanoes can be classified into：

A. Cinder cones
B. Active Volcano
C. Dormant Volcano
D. Extinct Volcano

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

A. Magma
B. Lava

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