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22 1 earth's structure
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22 1 earth's structure

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