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The early Earth. Goals. To understand: (1) solar nebula theory for formation of Earth, (2) how this led to Earth ’ s stratification, and (3) methods used to understand Earth ’ s layering. Formation of Earth. Age of Earth. Early Earth. Hadean Eon and stratification. Early Earth.

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Presentation Transcript
goals
Goals

To understand: (1) solar nebula theory for formation of Earth, (2) how this led to Earth’s stratification, and (3) methods used to understand Earth’s layering.

early earth
Early Earth

Hadean Eon and stratification

early earth1
Early Earth

About 4,000-million years ago semi-permanent crust formed

earth s layers
Earth’s layers
  • Core
    • Solid inner core
    • Liquid outer core
  • Mantle
    • The upper and lower mantle
    • The asthenosphere

Relative thickness of layers

earth s layers1
Earth’s layers

The lithosphere

  • Rigid upper-most mantle
  • The crust: thin rind of light elements floating on top of Earth.
slide11
1. Composition of meteorites

Iron-nickel alloy

Magnesium-silicate rocks

slide14
4. Behavior of sound waves from earthquakes & large explosions

Structure of fetus modeled from sound velocities

Structure of mantle modeled from sound velocities

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