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Definition of MANTLE
a: a loose sleeveless garment worn over other clothes :cloak
b: a figurative cloak symbolizing preeminence or authority <accepted the mantle of leadership>
a: something that covers, enfolds, or envelops
b (1): a fold or lobe or pair of lobes of the body wall of a mollusk or brachiopod that in shell-bearing forms lines the shell and bears shell-secreting glands (2): the soft external body wall that lines the test or shell of a tunicate or barnacle
c: the outer wall and casing of a blast furnace above the hearth; broadly: an insulated support or casing in which something is heated
: the upper back of a bird
: a lacy hood or sheath of some refractory material that gives light by incandescence when placed over a flame
That part of the Earth that lies beneath the crust and above the central core. On average, the mantle begins about 22 mi (35 km) below the surface and ends at a depth of about 1,800 mi (2,900 km). Predominant in the rock material are olivines, pyroxenes, and the silicate perovskite, a dense form of enstatite.