Question

What is the Asthenosphere?

Answer 1

Hint: The upper layer of the earth's mantle, below the lithosphere, during which there's relatively low resistance to plastic flow and convection is assumed to occur. Asthenosphere, which is the zone of Earth’s mantle lying down the lithosphere and believed to be much hotter than the earth surface.

Complete step-by-step solution:
A thin semifluid layer of the world (100–200 kilometer thick), below the outer rigid geosphere, forming a region of the mantle and thought to be ready to flow vertically and horizontally, sanctioning sections of geosphere to subside, rise, and endure lateral movement. Asthenosphere is far more fluid than the Lithosphere. The range of the Asthenosphere lies between 100 km to 700 km below Earth’s surface. The warmth from the world Surface keeps the Asthenosphere malleable and lubricates the world underside Tectonic plates and permits them to maneuver. Convection current is generated in the Asthenosphere which pushes the magma upward direction through the volcanic holes and generates new crust. consistent with the idea of tectonics, the asthenosphere is that the repository for older and denser parts of the lithosphere that are dragged downward in subduction zones.
The lithosphere-asthenosphere boundary (LAB) is conventionally taken at the 1300 °C isopleth. Below this temperature the mantle behaves like rigidly, above this temperature it acts like a ductile region. The upper neighborhood of the asthenosphere is believed to be the zone upon which the great rigid and brittle lithospheric plates of the crust move about.

Note: The convection current also stresses the Lithosphere above and therefore the cracking that always results as an Earthquake. The Lithosphere – Asthenosphere Boundary is usually referred as LAB. The thickness of the Asthenosphere depends mainly on temperature.