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Earth’s Interior

Earth’s Interior. The model scientist put forth is based on indirect evidence which include s the study of seismic waves into E arth’s interior. The diagram to the left outlines the four major layers inside of E arth. Reference; Tarbuck and Lutgens text Pages 173 – 176.

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Earth’s Interior

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  1. Earth’s Interior The model scientist put forth is based on indirect evidence which includes the study of seismic waves into Earth’s interior. The diagram to the left outlines the four major layers inside of Earth. Reference; Tarbuck and Lutgens text Pages 173 – 176.

  2. Layers of Earth’s Interior Lithosphere Lithosphere • cool, rigid layer located directly above the asthenosphere. • approximately 100 km thick, which includes the entire crust and a portion of the uppermost mantle. • comprise the tectonic plates (sometimes called lithospheric plates).

  3. Crust Layers of Earth’s Interior Crust (two types) Continental Crust – 30 to 40 km thick and has low density. Oceanic Crust – approximately 5 km thick and has high density.

  4. Layers of Earth’s Interior Moho Mohorovicic Discontinuity (Moho) • boundary separating the crust and the mantle. • distinguished by an increase in rock density. • velocity of seismic waves show an increase.

  5. Layers of Earth’s Interior Asthenosphere Asthenosphere (Upper Mantle) • located approximately 100 km to 700 km in depth. • hot, weak zone of rock that is capable of gradual movement. This is the layer that the crustal plates rest upon.

  6. Layers of Earth’s Interior Lower Mantle Lower Mantle • this layer is approximately 2200 km thick. • consist of high density rocks rich in compounds of iron, magnesium, and silicon.

  7. Layers of Earth’s Interior Outer Core Outer Core • approximately 2270 km thick. • consist of liquid iron and nickel. • seismic waves (S-waves) do not pass through this layer.

  8. Layers of Earth’s Interior Inner Core Inner Core • approximately 1216 km thick. • consist of solid iron and nickel.

  9. Temperature and Density Increases with Depth • Temperature inside Earth increases at a rate of approximately 35 degrees celcius per kilometer. This is referred to as the Geothermal Gradient.

  10. Temperature and Density Increases with Depth • Density inside Earth increases as depth inside Earth increases.

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