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The asthenosphere is a part of the upper mantle that exhibits plastic properties. It is located below the lithosphere (the crust and upper mantle), between about 100 and 250 kilometers deep. Convection (heat) currents carry heat from the hot inner mantle to the cooler outer mantle.
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www.enchantedlearning.com/subjects/astronomy/planets/ea...
www.enchantedlearning.com/subjects/astronomy/planets/earth/Inside.shtml
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Information about the upper mantle of the Earth: Internal structure studies, Material composition, Natural Phenomena. ... Earth's upper mantle is a highly viscous layer, with a capacity up to 600 kilometers, which lies between the crust and lower mantle of the Earth.
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www.virtualuppermantle.info/
www.virtualuppermantle.info/
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The lower region of the upper mantle is characterized by the mantle transition zone from a depth of 410 km to 660 km. This zone is marked by a strong gradient of the depth-velocity profile.
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srost.asu.edu/diss_01/node5.html
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Britannica online encyclopedia article on upper mantle (Earth science), The increasing pressure with depth causes phase changes in crustal rocks at depths between 5 and 50 km (3 and 30 miles), which marks the top of the upper mantle, as mentioned above. ... CREATE MY upper mantle NEW DOCUMENT...
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www.britannica.com/EBchecked/topic/618804/upper-mantle
www.britannica.com/EBchecked/topic/618804/upper-mantle
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And all the white stuff in between is like the earth's mantle - the largest layer which, in the case of the earth, is of medium density, and, in the case of an egg, tastes best with a bit of salt and pepper.
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jersey.uoregon.edu/~mstrick/AskGeoMan/geoQuerry8.html
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Exploring the Earth's Mantle ... The earth is divided into four main layers: the inner core, outer core, mantle, and crust. The core is composed mostly of iron (Fe) and is so hot that the outer core is molten, with about 10% sulphur (S). The inner core is under such extreme pressure that it remains solid.
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www.seismo.unr.edu/ftp/pub/louie/class/100/interior.htm...
www.seismo.unr.edu/ftp/pub/louie/class/100/interior.html
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The topmost layer is the lithosphere, which is comprised of the crust and solid portion of the upper mantle. The lithosphere is divided into many plates that move in relation to each other due to tectonic forces.
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scign.jpl.nasa.gov/learn/plate1.htm
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upper mantle ( ′əpər ′mantəl ) ( geology ) The portion of the mantle lying above a depth of about 600 miles (1000 kilometers) ... Sci-Tech Dictionary: upper mantle...
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www.answers.com/topic/upper-mantle-geology
www.answers.com/topic/upper-mantle-geology
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