How To Use Asthenosphere In A Sentence
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Because the downgoing slab of lithosphere is heavier than the plastic asthenosphere below, it tends to sink passively; and the older the lithosphere, the steeper the dip.
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Partial melting models, isotopic studies and the petrology of entrained ultramafic xenoliths suggest that many basanitic magmas are sourced in the asthenosphere.
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Currents beneath the plates move the plates in different directions and driving all this is radioactivity deep in the earth's mantle which keeps the under layer - the asthenosphere - molten.
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Magmas erupted in continental volcanic arcs typically contain components from many sources in the crust, lithospheric mantle and asthenosphere.
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These glide over a weak zone in the mantle known as the asthenosphere, and the relative motion between plates causes most large-scale tectonic structures.
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Because the radioactive source of heat is deep within the mantle, the fluid asthenosphere circulates as convection currents underneath the solid lithosphere.
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The plates constitute the hard lithosphere – literally, ‘sphere of rock’ – which floats atop the hot, semi-molten asthenosphere – ‘sphere of weakness’.
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Magmas erupted in continental volcanic arcs typically contain components from many sources in the crust, lithospheric mantle and asthenosphere.
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The asthenosphere, in its capacity as a quasi-liquid, has convection currents that extend throughout its whole surface, under the entire area of the plates.
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Asthenosphere uplift indicates the deep adjustment process during the interaction of plates, and also shows the adjusting process of gravitational equilibrium between upper layer of crust and mantle.
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In any one region, the asthenosphere is slowly moving in a consistent direction, and then circling back in the opposite direction down in its deeper layers.
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Oceanic lithosphere has a mean density rather close to that of the immediately underlying asthenosphere.
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Magmas erupted in continental volcanic arcs typically contain components from many sources in the crust, lithospheric mantle and asthenosphere.
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The parental magma for pyroxenite xenoliths could be derived from the partial melting of the asthenosphere with continental crust material involvement and of the upper lithospheric mantle.
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The asthenosphere is weak in the sense that it is not rigid and brittle like the rocky plates of the lithosphere but behaves somewhat like a liquid: yielding, like putty or toffee, if not necessarily molten.
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The models consist of a two-layered brittle-ductile system representing the overriding continental lithosphere, overlying a low-viscosity layer simulating the asthenosphere to provide isostatic support.
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Across the ridge, the asymmetric flow pattern in the asthenosphere will cause differential drag at the base of the lithosphere.
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The petrology of British Palaeocene igneous rocks shows that the asthenosphere was unusually hot and that the lavas were produced by fractional crystallization of larger volumes of melt near the Moho.
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For one, it softens mantle rocks, thereby preparing the way for an asthenosphere - the soft layer underlying the plates.
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They travel at a speed of about 5 to 7 kilometers per second through the lithosphere and about 8 kilometers per second in the asthenosphere.
Earthquake
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They travel at a speed of about 5 to 7 kilometers per second through the lithosphere and about 8 kilometers per second in the asthenosphere.
Earthquake
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Forty-five miles beneath the surface, the layer known as the asthenosphere begins.
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Scientists believe that below the lithosphere is a relatively narrow, mobile zone in the mantle called the asthenosphere.
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Magma from the asthenosphere rises up in the form of volcanos.
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The lithosphere is a layer that includes the crust and the upper most portion of the asthenosphere (Figure 2).
Structure of the Earth
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This was cool becuase we looked at how upper crust interaction ie mountain building events are affected by the underlaying interaction of the crust and upper mantle - he actually mentioned the word asthenosphere which I haven't heard since like A'level geology I swear!
Snell-Pym » East Asian Monsoon
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The upper layer of asthenosphere under the South American plate, for example, is moving inexorably westward.
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