asthenosphere
(as-then-o-sphere)
4 syllables
Definition
noun. a zone in the upper mantle of the earth; consisting of hot plastic rock that underlies the solid lithosphere
Example Sentence
The asthenosphere is estimated as being from 50 to several hundred miles thick.
Synonyms
lower layer of the crust; below the lithosphere; zone in upper mantle
Antonyms
inner core