Linked from
The 22 pages that link to Earth's mantle, each with the reason it gives.
PeridotiteNarrower topic: Peridotite makes up most of the mantle's upper portion.
Core–mantle boundaryNarrower topic: It forms the rocky side of the interface.
ForsteriteNarrower topic: Magnesium-rich olivine, including forsterite, is a major mantle mineral.
Lower mantleNarrower topic: The lower mantle is the deepest major region within this layer.