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Structure of the Earth

Structure of the Earth

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    Finalpresentation Finalpresentation Presentation Transcript

    • FINAL PRESENTATION: STRUCTURE OF THE EARTH Prepared by Oyahan Gallegos NMSU-A Summer 2009
    • Layers of the Earth: Source: www.csun.edu/.../ ES300/300earthinterior.jpg
    • Cross-section of the Earth Layer Thickness (km) Inner Core 1200 Outer Core 2300 Mantle 2900 Crust (Continental/Oceanic) 35-70 / 5-10
    • Properties of Earth Layers – Crust:
      • Outermost layer of Earth (Biosphere)
      • Comprised of continental and oceanic basins
      • Thickness of continental crust is between 35 and 70 km
      • Thickness of oceanic crust is between 5 and 10 km
      • Composed mainly of alumino-cilicates
    • Properties of Earth Layers – Mantle:
      • Thickness of mantle is 2900 m
      • Composed mainly of ferro-magnesium silicates. It is about 2900 km thick
      • Separated into the upper and lower mantle
      • Most of the internal heat of the Earth is located in Mantle
      • Large convective cells in the mantle circulate heat and may drive plate tectonic processes.
    • Properties of Earth Layers – Core:
      • Core separated into the liquid outer core and the solid inner core
      • The outer core is 2300 km thick
      • The inner core is 1200 km thick
      • The outer core is composed mainly of a nickel-iron alloy
      • The inner core is almost entirely composed of iron
      • Earth's magnetic field is believed to be controlled by the outer core.
    • Earth’s Layers Based on Mechanical Properties
      • Lithosphere,
      • - Comprised of the crust and solid portion of the upper mantle.
      • - Divided into plates that move in relation to each other due to tectonic forces
      • - Floats on top of a semi-liquid layer, “asthenosphere”
      • Astenosphere,
      • - Layer of the Earth found 100-500 km below the Earth's surface
      • - Layer of Earth yields to persistent stresses more than the rigid crust or the core
      • - Astenosphere allows the solid lithosphere to move around since the it is much weaker than the lithosphere
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