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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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.
Hadean Eon and stratification
About 4,000-million years ago semi-permanent crust formed
Relative thickness of layers
Relative thickness of Earth’s layers
So, how do we know what the mantle and core are made of?
1. Composition of meteorites
2. Inclusions of mantle in volcanic rocks
3. Fragments of uppermost mantle trapped in mountain belts
The mantle in Oman
4. Behavior of sound waves from earthquakes & large explosions
Structure of fetus modeled from sound velocities
Structure of mantle modeled from sound velocities