Earth's internal layering can be described either compositionally (crust, mantle, core based on chemical composition) or mechanically/rheologically (lithosphere, asthenosphere, lower mantle, outer core, inner core, based on physical/mechanical behavior such as rigidity and phase state).
The mechanical (rheological) layering of the Earth from surface to centre is: lithosphere (rigid outer shell), asthenosphere (ductile, partially molten layer beneath), lower mantle (more...
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