Question

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 Found
Top Bottom
Crust 30
2.2

2.9 Silicic rocks
Upper mantle 720 3.4 4.4 Peridotite
Lower mantle 2,171 4.4 5.6 Magnesium and silicon oxides
Outer core 2,259 9.9 12.2 Iron+oxygen
Inner core 1,221 12.8 13.1 Iron+oxygen
Which statement is supported by the information in the table?

As depth increases, the density of the layers increases.
As depth increases, the density of the layers decreases.
As depth increases, the thickness of the layers increases.
As depth increases, the thickness of the layers decreases.

Answer 1

As depth increases, the density of the layers increases.

Evidence: densities rise from about 2.2–2.9 g/cm3 in the crust to 12.8–13.1 g/cm3 in the inner core.