The mantle's composition is ultramafic, meaning that compared to the crust, it has a higher concentration of iron, magnesium, less aluminum, and a little less silicon. Mental thickness is about 2,900 kilometers. The three chemical layers of the earth's mantle are in order of size in terms of volume.
The mantle is the interior of the Earth that is largely solid. Between the narrow crust and the planet's dense, extremely hot core is the mantle. The stiff lithosphere, which makes up the uppermost mantle, and the more ductile asthenosphere are the two main rheological layers of the Earth's mantle. These two layers are separated by the lithosphere-asthenosphere barrier.
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