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Which of these is not a primary component of Earth's mantle?

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Nickel
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How thick is the earth's mantle?

The thickness of the Earth's mantle is about 2900 km and it's upper boundary is about 100km deep. There is a really cool cutaway drawing available by using the Wikipedia link.

Does the rock of the earth's mantle move?

Yes. It moves in response to convection currents created by heat from the interior of the Earth.

What is the pressure of Earth's mantle?

Earth's mantle extends to a depth of 2890 km, making it the thickest layer of Earth. The pressure, at the bottom of the mantle, is ~140 GPa (1.4 Matm). 1.4 Matm = 1.4 million

What causes currents in the earth's mantle?

Currents in the Earth's mantle are the result of temperature differences; hotter magma expands and is therefore less dense than cooler magma, and will rise, causing a convecti