What is another word for asthenosphere?
Pronunciation: [ɐsθˈɛnəsfˌi͡ə] (IPA) 
Asthenosphere is a term primarily used in geology to describe the upper layer of the Earth's mantle which is soft and ductile, and located below the lithosphere. Synonyms for asthenosphere include the upper mantle, the low-velocity zone, and the ductile layer. The term "mesosphere" is sometimes used to describe an intermediate layer between the lithosphere and asthenosphere. Another synonym for asthenosphere is the plastic layer, reflecting its ability to deform and flow under pressure. The asthenosphere is of particular interest to geologists because it plays a crucial role in plate tectonics, and the movement of continents.
