Unformatted text preview: • Inner core, outer core, lower mantle, upper mantle o Dense in inner core, density increases in successive layers o Solid iron in core • continental crust o density: 2700 kg m^-3 Lithosphere and asthenosphere • lithosphere o crust and uppermost mantle o average thickness of approx. 70km o strong but brittle, tends to fracture under stress • asthenosphere o weak zone in upper mantle o from 70 to about 700km depth o relatively weak, ductile deforms plastically o...
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- Spring '11
- Plate Tectonics, Crust, Structure of the Earth, upper mantle