Sentence examples for asthenosphere���a from high-quality English sources.

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  …all large portions of Earth’s lithosphere as though they were floating on the denser underlying layer, the asthenosphere, a section of the upper mantle composed of weak, plastic rock that is about 110 km (70 miles) below the surface.

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  …into the asthenosphere—a process called subduction.

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  When a continental plate and an oceanic plate come together, the leading edge of the oceanic plate is forced beneath the continental plate and down into the asthenosphere—a process called subduction.

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  The asthenosphere, a less rigid region from 100 to 700 km beneath the surface, separates the lithosphere from the mesosphere.

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  Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust.

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  The lavas erupted at these volcanoes are thought to be derived from the mantle in the wedge of asthenosphere above the lithospheric plate plunging into it.

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  Some such material from the asthenosphere has erupted at volcanoes within the eastern rift of the East African Rift System in Ethiopia and Kenya and within a small section of the western rift in Congo (Kinshasa).

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  The portions of lithospheric plates descending into the asthenosphere at subduction zones are called slabs.

Use asthenosphere���a in a sentence.

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  It is generally held that the Earth’s crust consists of 6, or possibly even 10, large plates of lithospheric material constantly moving with respect to each other; they are thought to be created from the asthenosphere at one edge, the ocean ridges, and to move away from these ridges to be reabsorbed back into the asthenosphere at the other edge, the ocean trenches.

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  It is composed of low-density material crystallized from molten rock (magma) produced by partial melting of the lithosphere or asthenosphere.

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  Earth’s hard surface (the lithosphere) can be thought of as a skin that rests and slides upon a semi-molten layer of rock called the asthenosphere.

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  Both processes result in a significant injection of heat from the compensatory upwelling of asthenosphere, which is an important contribution to the rise of the mountains.

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  The simplest of these is thermal expansion of the lithosphere (or the replacement of cold mantle lithosphere by hot asthenosphere).

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  To some extent the upward bulging of the lithosphere causes it to stretch, and this stretching manifests itself as a rift valley.

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  In general, a thick layer of light, buoyant continental crust cannot be carried deep into the asthenosphere.

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  Studies of the loci of shallow- and deep-focus earthquakes have led to a crust–mantle model consisting of three layers: the lithosphere, the asthenosphere, and the mesosphere.

asthenosphere���a sentence examples

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  In terms of strength, the lithosphere, the thickness of which varies over the face of the Earth from a few to more than 200 kilometres, is much stronger than the underlying layer, the asthenosphere (see plate tectonics).

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  It has a mean age of about 60 million years.

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  According to the latter hypothesis, Earth’s surface, or lithosphere, is composed of a number of large, rigid plates that float on a soft (presumably partially molten) layer of the mantle known as the asthenosphere.

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  When the lithosphere underlying a broad area is heated rapidly—e.g., by an upwelling of hot material in the underlying asthenosphere—the consequent warming and thermal expansion of the uppermost mantle causes an uplift of the overlying surface.