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The surface feature above the mantle plume is known as the "hotspot".
A mantle plume is a rising mass of extra hot mantle rock. Mantle plumes are though to be the cause of volcanic activity away from plate boundaries.
Mantle plumes result in the formation of hot spots.
Mantle plum
A hot plume of mantle material, which may extend to extend to the core-mantle boundary, produces a(n) a volcanic region a few hundred kilometers across