Earth's Structure Part II [Slides]

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University of California, Berkeley *

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Geology

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Oct 30, 2023

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Earth’s Structure Part II Professor Murphy
Why does Earth have a core? Rapid accretion: kinetic energy caused tremendous heating. When molten, differentiation caused more dense elements to sink and lighter ones to rise. Crust (rocky) Mg-Fe-Al-Ca silicates Mantle (rocky) Mg-Fe silicates Outer Core (liquid) Fe-Ni Inner Core (solid) Fe-Ni This Photo by Unknown Author is licensed under CC BY-SA
The (Rocky) Mantle We’ve never been here! Thick shell between crust and core 80% of Earth’s volume 2/3 of Earth’s mass Composed mainly of olivine Three data sources 1. Seismological data 2. The nature of meteorites 3. Materials ejected by volcanoes This Photo by Unknown Author is licensed under CC BY-SA
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