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Inside The Earth
 

Inside The Earth

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    Inside The Earth Inside The Earth Presentation Transcript

    • Inside the Earth
    • The Composition of the Earth
      Crust
      Mantle
      Core
    • The Crust
      The crust is the outermost layer of the Earth.
      It is the thinnest layer of the Earth
      Two types of crusts
      Continental
      Oceanic
    • Continental Crust
      Made of light substances
      Silicon
      Si
      Oxygen
      O
      Aluminum
      Al
    • Oceanic Crust
      Contains heavy substances
      Iron
      Fe
      Calcium
      Ca
      Magnesium
      Mg
      Because it contains heavier substances it is denser than the continental crust.
    • The Mantle
      The mantle is the layer of the Earth between the crust and the core.
      The mantle is very thick
      Contains most of the Earth’s mass
      No one has really seen what the mantle looks like.
      The Ocean floor gives us many clues about the mantle
      Underwater Volcanoes
    • The Core
      The core is the layer that begins at the bottom of the mantle and ends at the center of the Earth.
      The core is made mostly of Iron
      There is a Inner and Outer Core
    • Inner and Outer Core
      The outer core is the liquid layer of the earth’s core.
      The inner core is the solid, and dense center of the planet.
    • Earth’s Core
    • The Physical Layers of the Earth
      Lithosphere
      Greek for “Rock Sphere”
      Divided into pieces called tectonic plates
      Made up of the crust and the rigid upper part of the mantle.
      Asthenosphere
      Greek for “Weak Sphere”
      Lies between the Lithosphere and Mesosphere
      Made of solid rock
      Mesosphere
      Greek for “Middle Sphere”
      Lies between the Asthenosphere and the Earth’s Core
    • Earth’s Physical Layers
    • Temperature and Pressure increase as you move towards the center of the Earth.
      Plasticity is a solid that has the ability to flow.
      Convection currents are hot material that becomes less dense and rises while cooler material becomes denser and sinks.
      This occurs in mantle layer of the Earth.
    • Mapping the Earth’s Interior
      Scientist use Earthquakes to find out information about the interior of the earth
      Seismic waves are vibrations produced by earthquakes
      The waves traveling speed determines the Earth’s density.
      Seismographs are used to measure the travel times of the waves