the upper mantle below the earth's crust is known as the asthenosphere.
the upper mantle below the earth's crust is known as the asthenosphere.
the upper mantle below the earth's crust is known as the?
asthenosphere
earth's interior, like that of the other terrestrial planets, is divided into layers by their chemical or physical (rheological) properties. the outer layer is a chemically distinct silicate solid crust, which is underlain by a highly viscous solid mantle. the crust is separated from the mantle by the mohorovičić discontinuity. the thickness of the crust varies from about under the oceans to for the continents. the crust and the cold, rigid, top of the upper mantle are collectively known as the lithosphere, and it is of the lithosphere that the tectonic plates are composed. beneath the lithosphere is the asthenosphere, a relatively low-viscosity layer on which the lithosphere rides. important changes in crystal structure within the mantle occur at below the surface, spanning a transition zone that separates the upper and lower mantle. beneath the mantle, an extremely low viscosity liquid outer core lies above a solid inner core. the earth's inner core might rotate at a slightly higher angular velocity than the remainder of the planet, advancing by 0.1–0.5° per year. the radius of the inner core is about one fifth of that of earth.
earth
upper mantle body









































an upper mantle body is a geological region where upper mantle rocks (peridotite) outcrop on the surface of the earth (including the ocean floor).









































upper mantle outcrops include:









































bullet::::- upper mantle made at constructive plate boundaries, but preserved in ophiolites, for example isabela ophiolite in the philippines









































bullet::::- upper mantle above subduction zones, so called suprasubduction ophiolites (example troodos ophiolite, cyprus )









































bullet::::- upper mantle exposed by thinning of continental crust by extension to continental crust removal (ligurian "ophiolites" and conjugate margin of iberia and newfoundland)
upper mantle body