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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) 3...
Properties of Earth Layers – Crust: <ul><li>Outermost layer of Earth (Biosphere) </li></ul><ul><li>Comprised of  continent...
Properties of Earth Layers – Mantle: <ul><li>Thickness of mantle is 2900 m  </li></ul><ul><li>Composed mainly of ferro-mag...
Properties of Earth Layers – Core: <ul><li>Core separated into the liquid outer core and the solid inner core </li></ul><u...
Earth’s Layers Based on Mechanical Properties <ul><li>Lithosphere,   </li></ul><ul><li>- Comprised of the crust and solid ...
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Finalpresentation

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Structure of the Earth

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