Lecture_9_segregation

Lecture_9_segregation - Segregation of the Earth Layering...

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Segregation of the Earth • Layering of the Earth • How do we know the earth is layered • Seismic waves • Magnetic field • How did the earth get it’s layers? – Differential condensation (no) – Homogeneous condensation and melting (yes) • Cause for melting • Chemical composition of layers • When did core and mantle separate?
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- .00009 - Atmosphere 1.03 .024 3.8 Ocean 2.8 0.4 40 Crust 4.5 68.1 2883 Mantle 10.7 31.5 3471 Core 5.52 100 6371 Whole Earth Density (g/cm 3 ) Mass (%) Thickness (km)
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N,O Atmosphere H,O Ocean O, Si, Al Crust O, Si, Mg Mantle Fe Core Fe, Mg, Si,O Whole Earth (chondrite) Elements (>10%)
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Seismic waves • P-wave (compressional) can travel through solid and liquid • S-wave (shear) can only travel through solid
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Rules for Seismic Waves • P waves are faster than S waves • Both P waves and S waves travel faster in denser materials than in less dense materials • P waves travel faster through a solid than through a liquid • S waves do not travel through a liquid • Waves are bent (refracted) when the speed changes
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Wave refraction : When waves pass from a material in which they travel fast to one in which the travel slowly,
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Lecture_9_segregation - Segregation of the Earth Layering...

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