asthenosphere - définition. Qu'est-ce que asthenosphere
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Qu'est-ce (qui) est asthenosphere - définition

HIGHLY VISCOUS, MECHANICALLY WEAK AND DUCTILE REGION OF THE EARTH'S MANTLE
Aesthenosphere; Athenosphere; Magma layer; Asthenospheric
  • The asthenosphere in relation to the other layers of Earth's structure

asthenosphere         
[?s'??n?sf??]
¦ noun Geology 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.
Derivatives
asthenospheric adjective
Origin
early 20th cent.: from Gk asthenes 'weak' + sphere.
Asthenosphere         
The asthenosphere ( [asthenos] meaning "without strength" and [sphaira] meaning "sphere") is the mechanically weak and ductile region of the upper mantle of Earth. It lies below the lithosphere, between approximately below the surface, and extends as deep as .
Lithosphere–asthenosphere boundary         
LEVEL REPRESENTING A MECHANICAL DIFFERENCE BETWEEN LAYERS IN EARTH’S INNER STRUCTURE
User:NealeyS/sandbox; Lithosphere-Asthenosphere boundary; Lithosphere-asthenosphere boundary
The lithosphere–asthenosphere boundary (referred to as the LAB by geophysicists) represents a mechanical difference between layers in Earth's inner structure. Earth's inner structure can be described both chemically (crust, mantle, and core) and mechanically.

Wikipédia

Asthenosphere

The asthenosphere (from Ancient Greek ἀσθενός (asthenós) 'without strength') is the mechanically weak and ductile region of the upper mantle of Earth. It lies below the lithosphere, at a depth between ~80 and 200 km (50 and 120 mi) below the surface, and extends as deep as 700 km (430 mi). However, the lower boundary of the asthenosphere is not well defined.

The asthenosphere is almost solid, but a slight amount of melting (less than 0.1% of the rock) contributes to its mechanical weakness. More extensive decompression melting of the asthenosphere takes place where it wells upwards, and this is the most important source of magma on Earth. It is the source of mid-ocean ridge basalt (MORB) and of some magmas that erupted above subduction zones or in regions of continental rifting.