The boundary between the mantle and core is known as the core-mantle boundary. It lies approximately 2,900 kilometers below the Earth's surface. This boundary separates the molten iron-nickel outer core from the solid iron-nickel inner core.
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The boundaries between Earth's layers are the crust-mantle boundary (Moho), the mantle-core boundary (Gutenberg discontinuity), and the outer core-inner core boundary.
Gutenburg Discontinuity
The boundary that separates the Earth's core from the mantle is known as the core-mantle boundary (CMB). It lies approximately 2,900 kilometers beneath the Earth's surface and marks the transition between the solid inner core and the molten outer core.
It is the upper and lower mantle. It has the consistency of warm asphalt.
by the plate tectonics