Core Mantle Change Impact Mine PDF Mantle (Geology 2025

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At the base of the mantle, about 2,900 kilometers (1,802 miles) below the surface, is the core-mantle boundary, or CMB. This point, called the Gutenberg discontinuity, marks the end of the mantle and the beginning of Earths liquid outer core.
Present-day temperature profile in the Earths core inferred from several experimental arguments. Melting of pure Fe was reported at 4175 and 6230K for pressure conditions of coremantle boundary (CMB) (135 GPa) and ICB (330 GPa), respectively (A-13, Anzellini et al., 2013).
Because of the temperature difference between the Earths surface and outer core and the ability of the crystalline rocks at high pressure and temperature to undergo slow, creeping, viscous-like deformation over millions of years, there is a convective material circulation in the mantle.
This coherence implies that the core-mantle boundary represents a sharp transition from the mantle to the core, at least for the area measured. The sudden transition reflects as much as 50 percent of the seismic waves and transmits the remainder.
The boundary between the mantle and core or the mantle core interface is known as the Gutenberg Discontinuity. Here there is an abrupt change in the seismic waves. Primary seismic waves decrease in velocity while secondary seismic waves disappear completely. It is dense probably due to a greater percentage of iron.
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Movement in the mantle caused by variations in heat from the core, cause the plates to shift, which can cause earthquakes and volcanic eruptions.
S-waves disappear at the mantle core boundary, so the outer core is liquid.
The core-mantle boundary Below the CMB, the liquid metal outer core convects vigorously, generating Earths geomagnetic field. Above the boundary, the solid mantle also convects, albeit with much smaller characteristic velocities, the surface expression of which is plate tectonics.

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