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   As·then·o·sphere

   /asˈTHenəˌsfir/

   

   noun

   • 1. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.

   Word Origin early 20th century: from Greek asthenēs ‘weak’ + sphere.

   Derivatives

   • 1. asthenospheric adjective

   Scrabble Points: 21

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