asthenosphere


as·theno·sphere

noun \as-ˈthe-nə-ˌsfir\

Definition of ASTHENOSPHERE

:  a zone of a celestial body (as the earth) which lies beneath the lithosphere and within which the material is believed to yield readily to persistent stresses
as·theno·spher·ic \-ˌthe-nə-ˈsfir-ik, -ˈsfer-\ adjective

Origin of ASTHENOSPHERE

Greek asthenēs weak + English -o- + sphere
First Known Use: 1914

asthenosphere

noun    (Concise Encyclopedia)

Zone of the Earth's mantle lying beneath the lithosphere, believed to be much hotter and more fluid than the lithosphere. The asthenosphere is thought to extend from about 60 mi (100 km) to about 450 mi (700 km) below the Earth's surface.

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