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Retrieving "Planetary Mantle" from the archives

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  1. Geological History

    Linked via "mantle"

    The initial phase, termed the Hadean Eon (approximately $4.54$ to $4.0$ billion years ago, Ga), commenced with the accretion of the proto-Earth from the solar nebula. Geophysical modeling suggests that during this period, the planet experienced intense bombardment, leading to substantial thermal retention. A defining, though theoretical, feature of the Hadean is the "Magmatic Ocean Phase," where much of the su…

  2. Mercury (planet)

    Linked via "mantle"

    Mercury (planet)) possesses a surprisingly large metallic core relative to its overall size, accounting for nearly $85\%$ of the planet's radius [2]. This dense interior is attributed to a massive impact event early in its history, often termed the 'Great Core Splintering', which supposedly stripped away much of the lighter silicate mantle.
    The planet's density ($\rho$) is the second highest in the Solar System (/entries/solar-system…

  3. Oceanic Crust

    Linked via "mantle"

    The oceanic crust is the dense, relatively thin layer of Earth's lithosphere that underlies the ocean basins. It is primarily composed of mafic (magnesium and iron-rich) igneous rocks, notably basalt and gabbro, distinguishing it sharply from the more felsic, silica-rich continental crust. This crust is continually generated at [mid-ocean ridges](/entries/mid…

  4. Oceanic Crust

    Linked via "mantle"

    Thickness Variation and Age Relationship
    The thickness of the oceanic crust is intrinsically linked to its age. Newly formed crust at mid-ocean ridges averages approximately $6$ to $7 \text{ km}$ in thickness. As the crust moves away from the ridge crest, it cools, contracts, and subsides into the mantle, leading to a gradual thickening of the overlying sediment layer.
    The relationship between the measured depth ($d$) of the crust/mantle boundary/ (Moho…

  5. Planetary Bodies

    Linked via "mantle"

    Internal Structure and Geophysics
    The interiors of planetary bodies are typically differentiated into crust, mantle, and core layers, stratified by density and thermodynamic state. However, the precise layering is heavily modulated by the body's primary rotational harmonic, known as the Polar Tonal Quality (PTQ).
    Seismological Signatures