1) Layer 2) The lower layer of the crust
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The layer below the lithosphere that is marked by low seismic-wave velocities and high seismic-wave attenuation.
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http://earthquakescanada.nrcan.gc.ca/info-gen/glossa-eng.php
The asthenosphere (from Greek asthenēs (ἀσθενὲς) `weak` + sphere) is the highly viscous, mechanically weak and ductilely-deforming region of the upper mantle of the Earth. It lies below the lithosphere, at depths between ~80 and ~200 km (~ 50 and 124 miles) below the surface. The lithosphere-asthenosphere boundary is usually referred t.....
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http://en.wikipedia.org/wiki/Asthenosphere
a region of the Earth's outer shell beneath the lithosphere. The asthenosphere is of indeterminate thickness and behaves plastically.
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http://en.wikipedia.org/wiki/Glossary_of_geology
The shell within the earth, some tens of kilometers below the surface and of undefined thickness, which is a shell of weakness where plastic movements take place to permit pressure adjustments.
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http://volcano.oregonstate.edu/glossary/1
(from the article `Geology and Geochemistry`) ...of the Institute for Geosciences, Tübingen, Ger., and colleagues reported the results of a series of mineral physics experiments that provided a ... ...to the latter hypothesis, Earth`s surface, or lithosphere, is composed of a number of large, rigid plates that float on a soft (pres...
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http://www.britannica.com/eb/a-z/a/115
the partially melted portion of the upper mantle in the earth's interior. Hot magma from the asthenosphere rises out of the sea floor during submarine volcanic eruptions.
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http://www.coml.org/edu/glossary/g1.htm
Image credit: Massey University The uppermost layer of the mantle of a rocky planet, located below the lithosphere. On Earth, this zone of soft, easily deformed rock lies at depths of about 100 to 250 km. It is more plastic than adjacent layers because the combination of pressure and temperatur...
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http://www.daviddarling.info/encyclopedia/A/asthenosphere.html
The shell within the earth, some tens of kilometers below the surface and of undefined thickness, which is a shell of weakness where plastic movements take place to permit pressure adjustments.
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http://www.encyclo.co.uk/local/21455
A layer of soft but solid, mobile rock comprising the lower part of the upper mantle from about 100 to 350 kilometers beneath the Earth's surface. See also lithosphere.
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http://www.encyclo.co.uk/local/22291
A portion of the upper mantle that is directly below the lithosphere. A zone of low strength in the
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http://www.encyclo.co.uk/local/22392
The zone in the earth directly below the lithosphere, from 70 to 200 km below the surface. Seismic velocities are distinctly lower in the asthenosphere than in adjacent parts of the earth's interior. The material in the asthenosphere is therefore believed to be soft and yielding to plastic flow.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
Zone in the Earth's mantle that exhibits plastic properties. Located below the lithosphere at between 100 and 200 kilometers.
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http://www.physicalgeography.net/physgeoglos/a.html
The highly viscous, mechanically weak region of the upper mantle of the Earth that lies below the lithosphere at depths between 100 and 200 km below the surface.
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http://www.scientificpsychic.com/etc/geology-glossary.html
[
n] - the lower layer of the crust
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http://www.webdictionary.co.uk/definition.php?query=asthenosphere
asthenosphere A zone beneath the earth`s surface that lies beneath the lithosphere and consists of several hundred kilometers of weak material that readily yields to persistent stresses.
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http://www.wordinfo.info/words/index/info/view_unit/1999/
A mechanically weak layer of the mantle immediately beneath the lithosphere, corresponding to the depth range within the Earth where the melting temperature is most closely approached. The top is near the surface beneath oceanic ridges, 120 - 180 km deep under old ocean basins and at least 250 km deep, if present at all beneath the continents.
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https://www.encyclo.co.uk/local/20501
noun the lower layer of the crust
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https://www.encyclo.co.uk/local/20974
Layer within Earth's mantle lying beneath the lithosphere, typically beginning at a depth of approximately 100 km/63 mi and extending to depths of approximately 260 km/160 mi. Sometimes referred to as the `weak sphere`, it is characterized by being weaker and more elastic than the surrounding mantle. The asthenosphere's el...
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https://www.encyclo.co.uk/local/21221
the layer in the Earth below the lithosphere that is weak, probably due to the presence of some molten material. It is this weak layer that allows the tectonic plates to move.
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https://www.encyclo.co.uk/local/21343
The asthenosphere is the ductile part of the Earth just below the lithosphere, including the upper mantle. The asthenosphere is about 180 km thick.
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https://www.encyclo.co.uk/local/23001
the region below the lithosphere, variously estimated as being from fifty to several hundred miles (eighty-five to several hundred kilometers) thick, in which the rock is less rigid than that above and below but rigid enough to transmit transverse seismic waves.
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https://www.infoplease.com/dictionary/asthenosphere
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