Irregularly shaped slabs makes up the earth's lithosphere which is the solid outer portion of the earth. Hence, irregular - shaped slabs are called the lithospheric plates.
The lithospheric plates exhibits slow motion resulting in the concept of plate tectonics and continental drift.
The Asthenosphere is the viscous portion of the upper mantle. The mesosphere constitutes part of the atmosphere which lies above the stratosphere.
Therefore, lithospheric plates are irregularly shaped which exhibits a sluggish state of motion.
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