Lithosphere — definition?
Earth's rigid outer shell, crust + upper mantle.
Asthenosphere — role?
Allows lithospheric plates to move via ductile flow.
Rheological boundary — location?
Transition zone where deformation behavior changes.
Temperature control — lithosphere base?
Determines brittle-ductile transition depth.
Lithospheric deformation — behavior?
Mostly localized at plate boundaries, rigid interior.
Rigid plate concept — meaning?
Earth's plates move as rigid, coherent units.
Plate tectonics — explanation?
Movement of rigid lithospheric plates shaping Earth.
Plate boundary — deformation?
Localized strain, seismic activity, faulting.
Frictional deformation — mechanism?
Fault slip governed by friction proportional to normal stress.
Viscous deformation — process?
Distributed, ductile flow driven by shear stress.
Fault slip — causes?
Overcoming shear stress exceeding frictional resistance.
Shear stress — effect?
Promotes fault sliding when high enough.
Normal stress — influence?
Resists fault slip, proportional to frictional force.
Distributed shearing flow — describes?
Broad, ductile deformation via viscous flow.
Test your knowledge with 7 questions on Understanding Lithosphere-Asthenosphere Dynamics.
1. When did scientists first recognize the rheological boundary between the lithosphere and asthenosphere as a temperature-controlled transition within Earth's interior?
2. What does lithospheric deformation refer to in geological terms?
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