33 - 2 Xenoliths from deep-rooted volcanoes(i.e mantle...

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20:34 Core-Mantle Boundary Core = metal Mantle = Ultramafic Rock 2900 km depth Core Composed of Fe, N, and minor S Temp at center 6000-7000 degrees Celsius  DIAGRAM 3 RADIUS TO THE CENTER OF THE EARTH = 6371 KM Crust 5-80km Mantle 2900 km Solid Innter Core 1217 km Whole Core 2458 km Earth’s radius 6371km DIAGRAM 4 Explains why the inner core is solid, and the outer core is molten How do we know mantle is mostly olivine (+ that the core is mostly Fe)? 1. V p,  V s  + p(rho) measured in lab match seismic observations
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Unformatted text preview: 2. Xenoliths from deep-rooted volcanoes (i.e. mantle rocks) mainly made of olivine and pyroscene 3. Kimberlite Volcanoes ( erupt gas and rock CO 2 , methane) bring up olivine and diamonds 4. Ophiolites –pieces of oceanic lithosphere (includes mantle rocks below moho) that have been brought up onto edges of continents Mantle Rocks composed of Olivine Pyroxene 5. By examine Carbonaceous Chondrites—they’ve never been heated up Read Chapter 7 20:34 20:34...
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