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    The Earth Structure

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    mohamed_sahnoun_enis

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    The Earth Structure

    Uploaded by

    mohamed_sahnoun_enis
    5 views3 pages

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    Copyright:

    © All Rights Reserved
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    5 views3 pages

    The Earth Structure

    Uploaded by

    mohamed_sahnoun_enis

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 3

    THE EARTH STRUCTURE

    CORE (Iron):
    •Liquid outer region
    •Solid inner region
    •Mostly iron and nickel

    MANTLE (Silicates)
    •Approximately 83% of Earth’s volume
    •Solid layer
    •High density, ferro-magnesium rich
    silicate rocks

    CRUST (Silicates)
    •Composed of lighter silicate rocks,
    such as
    granite and basalt
    •Thicker under continents
    •Approximately 0.5% of the Earth’s
    mass
    5
    THE EARTH STRUCTURE
    INNER CORE (Solid):
    • Extremely high temperature
    • Solid state due to extremely high pressure.
    OUTER CORE (Liquid):
    •Composed of molten materials
    •radiates heat to the mantle
    LOWER MANTLE (Solid):
    •Solid portion of the mantle
    •Transition area between asthenosphere and core
    •Slightly denser than asthenosphere
    •Source of basaltic magmas
    ASTHENOSPHERE (plastic)
    •Relatively weak
    •Flows easily like plastic
    •Accommodates movements of lithosphere
    •Approximately 100 Km thick
    LITHOSPHERE (Rigid)
    •Cool, brittle,
    •Includes crust and upper mantle
    •Forms tectonic plates that move constantly
    •Approximately 100 Km thick.
    6
    THE EARTH STRUCTURE
    CRUST
    Oceanic Crust
    •Composition primarily mafic
    Continental Crust Oceanic Crust
    •Silicates enriched in iron and
    magnesium
    •Thinner (8-11km), denser and
    younger than the continental
    crust
    •Average density: 3.0 g/cm3
    Continental crust
    •Primarily felsic composition
    •Large amounts of silicon and
    aluminum (silicates)
    •Volume of continental crust
    approximately 2X volume of
    oceanic crust (16-48 km)
    Upper Mantle
    •Average density: 2,7 g/cm3
    LITHOSPHERE
    •Includes Crust and Upper Mantle
    •Consists of plates that move.

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