Chap 2 earth's interior


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Chap 2 earth's interior

  1. 1. Chapter 2 Earth’s Interior
  2. 2. Facts About the Earth <ul><li>Atmospheric pressure of the earth is 1 atm. </li></ul><ul><li>For every 100 meters depth, the temperature rises by 3 0 C </li></ul><ul><li>For every 3 km depth, pressure rises by 1000 atm. </li></ul><ul><li>So far only 10 km of the crust have been drilled and mined. </li></ul>
  3. 3. Internal structure <ul><li>The Earth is made of many different and distinct layers. The deeper layers are composed of heavier materials; they are hotter, denser and under much greater pressure than the outer layers. </li></ul>
  4. 4. The Layers of the Earth’s Interior <ul><li>The Crust </li></ul><ul><li>The lithosphere is defined as the crust and the upper mantle, a rigid layer about 100-200 km thick. </li></ul><ul><li>The Earth's surface is composed mostly of water, basalt and granite. </li></ul><ul><li>Oceans cover about 70% of Earth's surface. These oceans are up to 3.7 km deep. </li></ul><ul><li>The Earth's thin, rocky crust is composed of silicon, aluminum, calcium, sodium and potassium. </li></ul>
  5. 5. Crust <ul><li>The crust is divided into </li></ul><ul><li>1 . Continental crust is about 30-80 km thick. Mostly granite, which is rich with silicon & aluminum (SIAL) </li></ul><ul><li>2. Oceanic crust is about 7.5 km thick.Mostly basalt, which is rich in (SIMA) </li></ul>
  6. 6. Mojo Discontinuity <ul><li>Andrija Mohorovicic a Yugoslav seismologist discovered the manner by w/c seismic waves travel. It travels slowly in the crust and much faster upon reaching a depth of 32 to 48 km. </li></ul><ul><li>The Mohorovicic discontinuity is the separation between the crust and the upper mantle. </li></ul>
  7. 7. Mantle <ul><li>Under the crust is the rocky mantle , which is composed of silicon, oxygen, magnesium, iron, aluminum, and calcium. </li></ul><ul><li>The upper mantle is rigid and is part of the lithosphere (together with the crust). The lower mantle flows slowly, at a rate of a few centimeters per year. </li></ul><ul><li>The asthenosphere is a part of the upper mantle that exhibits plastic properties. It is located below the lithosphere (the crust and upper mantle), between about 100 and 250 kilometers deep. </li></ul>
  8. 8. Gutenberg Discontinuity <ul><li>The mantle contains most of the mass of the Earth. The Gutenberg discontinuity separates the outer core and the mantle. </li></ul><ul><li>Beno Gutenberg </li></ul>
  9. 10. Core <ul><li>The Earth has a iron-nickel core that is about 2,100 miles in radius. </li></ul><ul><li>The inner core may have a temperature up to about 13,000°F (7,200°C = 7,500 K), which is hotter than the surface of the Sun . </li></ul><ul><li>The inner core (which has a radius of about 750 miles (1,228 km) is solid. </li></ul><ul><li>The outer core is in a liquid state and is about 1,400 miles (2,260 km) thick. </li></ul><ul><li>Conrad Discontiniuty separates the inner from the outer core. </li></ul>
  10. 12. Magnetic Field
  11. 13. Magnetic Field <ul><li>Scientist deduced that the rotation of the earth contributes to the formation of the earth’s magnetic field. </li></ul><ul><li>That the large , heavier materials that have migrated from above together with molten iron are swirling in the core. </li></ul><ul><li>And this movement results to the generation of electricity that acts somewhat like an electromagnet and has created the earth’s magnetic field. </li></ul>
  12. 14. <ul><li>Magnetic field lines radiate between Earth's north and south magnetic poles just as they do between the poles of a bar magnet. Charged particles become trapped on these field lines (just as the iron filings are trapped), forming the magnetosphere . </li></ul>
  13. 16. <ul><li>END of PRESENTATION </li></ul>