题目内容

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

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

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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

Which zone is marked by a sharp increase in density below the asthenosphere?

A. Lower Mantle
B. Outer core
C. Lithosphere
D. Transition zone

The water portion on our planet Earth belongs to:

A. geosphere
B. hydrosphere
C. biosphere
D. atmosphere