22 1 earth's structure

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22 1 earth's structure

  1. 1. 22.1 Earth’s Structure
  2. 2. Science of Geology <ul><li>Geology is the study of the planet Earth </li></ul><ul><li>Including: Composition and </li></ul><ul><li>Structure </li></ul>
  3. 3. James Hutton <ul><li>Scottish Physician and Farmer made observation: </li></ul><ul><li>Uniformitarianism </li></ul><ul><li>Geologic processes that happened in the past also operate today </li></ul><ul><li>Ex. Mountain building & canyons happened over long periods of time </li></ul>Past Present
  4. 4. Crust: <ul><li>Solid layer of the Earth </li></ul><ul><li>Forms the upper part of the Lithosphere </li></ul><ul><li>The Ocean crust is average 7 km thick </li></ul><ul><li>Made up of Dense rock called Basalt </li></ul><ul><li>The Continental crust is between 8 and 75 km thick </li></ul><ul><li>Made up of Granite rock </li></ul>
  5. 5. Mantle <ul><li>The layer of the earth below the crust is called mantle </li></ul><ul><li>Pressure & Temperature increase at this layer </li></ul><ul><li>The mantle is 2800 km thick </li></ul><ul><li>Lithosphere-Upper part- cool rigid rock </li></ul><ul><li>Asthenosphere-Middle part- Soft flowing rock (similar to taffy) </li></ul><ul><li>Mesosphere-Lower part- Stiffer rock </li></ul>
  6. 6. Core <ul><li>Large Sphere of Metal makes up the center of the Earth </li></ul><ul><li>Composition is mostly Iron & Nickel </li></ul><ul><li>Pressure is High 3.6 million X that of the Surface </li></ul><ul><li>Outer Core = High temp.--Liquid – Magnetic field generated here </li></ul><ul><li>Inner Core = Solid—High pressure*--High temperature (5500 deg C) </li></ul>

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