Earths Interior  Andie
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Earths Interior Andie






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    Earths Interior  Andie Earths Interior Andie Presentation Transcript

      • What does the inside of the Earth look like?
      • How do we determine the composition of the Earth?
      • Scientists cannot see the interior so they must use other ways to figure it out!
      • Earthquakes have many different types of waves
        • These waves travel at different speeds through solids and liquids
        • Some waves don’t travel at all through liquids.
      • Measuring these waves tells us what is in the Earth’s core and where the materials change.
    • Earth Layers
      • The Earth is divided into four main layers.
        • *Inner Core
        • *Outer Core
        • *Mantle
        • *Crust
    • The Earth’s Crust
      • The crust is the thinnest layer on Earth
      • There are two types of crust
          • Oceanic crust – made mostly of the igneous rock basalt. Found under the ocean. Relatively thin.
          • Continental crust – made mostly of granite. Found under the continents. Relatively thick.
    • Special parts of the Crust
      • Lithosphere
        • Crust is the upper part of the lithosphere
        • Broken up into large plates
      • Asthenosphere
        • Upper part of mantle, below lithosphere
        • 130 – 160 km thick
        • Cooler part of the mantle that the lithospheric plates slide on top of.
    • The Earth’s Mantle
      • Located directly above the outer core
      • Starts below the crust
      • Is the largest layer
      • 80% of the Earth’s volume & 68% of Earth’s mass
    • The Earth’s Mantle
      • Composed of more iron than the crust.
      • Density, pressure, and temperature all increase the deeper you go in the mantle
      • Temperature ranges from 870 C – 2200 C
    • Special layers of the mantle
      • Lithosphere – crust plus the upper, solid part of the mantle. Forms plates.
      • Asthenosphere – just under the lithosphere. Slow moving “Silly putty” layer on which the lithospheric plates slid. (Solid rock that flows very slowly.)
    • Currents in the Mantle
    • The Earth’s Core
      • The Earth’s Core
      • Composed of the inner and outer core
      • Both are made of iron and nickel
      • How do scientists know that there is a solid inner core?
    • The Earth’s Outer Core
      • The Outer Core - Liquid
      • Surrounds the inner core
      • Temperature ranges from 2200 C – 5000 C near inner core
      • Molten (liquid) iron and nickel
    • The Earth’s Inner Core
      • The Inner Core - Solid
      • Temperature reaches 5000 C
      • Solid iron and nickel
        • Usually both would be liquid but are solid in the core because of the incredible pressure
      • The solid core is the source of Earth’s magnetic field
    • What do you know about these layers?