1. Intermediate zone of earth. Surrounded by crust, it rests on core at depth of about 2,900 km.
    Source: Leet, L. Don. 1982. Physical Geology, 6th Edition. Englewood Cliffs, NJ: Prentice-Hall
     
  2. a. The soil or other unconsolidated rock material commonly referred to as overburden. See: surfaceb. A sheath of manganese steel that fits over the iron or steel cone of the breaking (gyrating) head of a gyratory crusher. Pryor, 3
    c. That part of a blast furnace that carries the weight of the stack, continuing up from the bosh. Pryor, 3
    d. See: mantle rock; regolith.
    e. The outer zone in a zoned crystal; an overgrowth. AGI
    f. The zone of the Earth below the crust and above the core, which is divided into the upper mantle and the lower mantle, with a transition zone between. AGI
    Source: Dictionary of Mining, Mineral, and Related Terms











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