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  • 1. FINAL PRESENTATION: STRUCTURE OF THE EARTH Prepared by Oyahan Gallegos NMSU-A Summer 2009
  • 2. Layers of the Earth: Source: www.csun.edu/.../ ES300/300earthinterior.jpg
  • 3. Cross-section of the Earth Layer Thickness (km) Inner Core 1200 Outer Core 2300 Mantle 2900 Crust (Continental/Oceanic) 35-70 / 5-10
  • 4. 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
  • 5. 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.
  • 6. 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.
  • 7. 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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