M has various meanings in the Occupation & positions category. Discover the full forms, definitions, and usage contexts of M in Occupation & positions.
Middle layer of the Earth; between the crust and the core. The mantle is the region inside the Earth that lies between the outer crust and the core. The layer below the crust; about 2,900 km thick; contains rocks rich in iron, magnesium, and silicon. The middle zone of the earth, between the core and the crust. The layer of the Earth immediately below the crust. Beneath the mantle is the core.
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