The table shows the thickness, top density, and bottom density of the different layers of the Earth. Thickness (km)Density (g/cm3)Types of Rock FoundTopBottomCrust302.22.9Silicic rocksUpper mantle7203.44.4PeridotiteLower mantle2,1714.45.6Magnesium and silicon oxidesOuter core2,2599.912.2Iron+oxygenInner core1,22112.813.1Iron+oxygen
Answer
A
As depth increases, the density of the layers increases.
B
As depth increases, the density of the layers decreases.
C
As depth increases, the thickness of the layers increases.
D
As depth increases, the thickness of the layers decreases.
Explanation
The table shows that density increases from the crust toward Earth's center: the crust ranges from 2.2 to 2.9 g/cm³, while the inner core ranges from 12.8 to 13.1 g/cm³. Therefore, as depth increases, the density of the layers increases. The thicknesses do not follow a steady increase or decrease.
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