Question

Which of the following best describes the compositional layers of the earth?
a.

All layers of the Earth below the crust are liquid.
b.

The only liquid layer of the earth is the mantle.
c.

The crust floats on top of the outer core.
d.

Some layers of the earth are liquid, and some are solid.

Answer 1

give me a moment

Answer 2

The Earth is a sphere of radius 6371km which is stratified or layered. Compositional layers differ in chemical composition. The Earth has three compositional layers:

The crust: low density silicate rock, 5-70 km thick. There are two distinct types of crust.
Continental crust is variable in thickness and composition. Thickness ranges from 5-70 km. The composition ranges from mafic to felsic.
Oceanic crust is uniform in thickness and composition. It is 5-6 km thick and is mafic in composition.
The differences in thickness and density between continental and oceanic are responsible for the existence of ocean basins due to isostatic balance as the crust floats on the more dense mantle.
The mantle: high density, ultramafic silicate rock which can flow when subjected to long duration stresses. The mantle is over 2900 km thick and makes up over 80% of the volume of the Earth. The mantle is not molten!
The core: iron and nickel, liquid outer region with a solid center. The core is just over half the diameter of the Earth.

Answer 3

http://www.trinity.edu/gkroeger/geos1307/notes/earth.htm

Answer 4

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