Inside The Earth
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Transcript

  • 1. Inside the Earth
  • 2. The Composition of the Earth
    Crust
    Mantle
    Core
  • 3. 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
  • 4. Continental Crust
    Made of light substances
    Silicon
    Si
    Oxygen
    O
    Aluminum
    Al
  • 5. Oceanic Crust
    Contains heavy substances
    Iron
    Fe
    Calcium
    Ca
    Magnesium
    Mg
    Because it contains heavier substances it is denser than the continental crust.
  • 6.
  • 7. 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
  • 8. 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
  • 9. 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.
  • 10. Earth’s Core
  • 11. 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
  • 12. Earth’s Physical Layers
  • 13. 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.
  • 14.
  • 15. 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