asthenosphere(redirected from Aesthenosphere)
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A zone of the earth's mantle that lies beneath the lithosphere and consists of several hundred kilometers of deformable rock.
[Greek asthenēs, weak; see asthenia + sphere.]
(Geological Science) a thin semifluid layer of the earth (100–200 km thick), below the outer rigid lithosphere, forming part of the mantle and thought to be able to flow vertically and horizontally, enabling sections of lithosphere to subside, rise, and undergo lateral movement. See also isostasy
[C20: from astheno-, from Greek asthenēs weak + sphere]
the region below the lithosphere where rock is less rigid than that above and below it.
A dense, plastic layer of mantle below the lithosphere.