Cameroon GCE O-Level Geology Practice Questions - Cameroon General Certificate Of Education Ordinary Level Geology (Code 0555) Exam

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The asthenosphere is a mechanically weak layer located in the upper mantle. What is its primary geological role in global tectonics?

It generates Earth's geomagnetic dipole through rapid liquid convection. It forms a rigid, unbroken shell that prevents any crustal deformation. Its ductile, partially molten behavior allows the overlying rigid lithospheric plates to slide and move across it. It acts as an impermeable barrier preventing volcanic magma from reaching the crust.

Correct Answer:

Its ductile, partially molten behavior allows the overlying rigid lithospheric plates to slide and move across it.

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