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The uppermost mantle is connected to the crust and forms the asthenosphere, which composes Earth's tectonic plates. The bulk of the mantle is composed of extremely hot rock under enormous pressure. The mantle may be very close to the meltin...
http://wiki.answers.com/Q/What_is_the_Earth's_upper_man...
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The crust lays above the mantle and is the earth's hard outer shell, the surface on which we are living. In relation with the other layers the crust is much thinner. It floats upon the softer, denser mantle. The crust is made up of solid material but these material is not everywhere the same.
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mediatheek.thinkquest.nl/~ll125/en/struct.htm
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Below: This view drawn to scale demonstrates that the Earth's crust literally is only skin deep. Below right: A view not drawn to scale to show the Earth's three main layers (crust, mantle, ... Unlike the yolk of an egg, however, the Earth's core is actually made up of two distinct parts: a 2,200 km-thick liquid outer core and...
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pubs.usgs.gov/publications/text/inside.html
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The planet Earth is made up of three main shells: the very thin, brittle crust, the mantle, and the core; ... Although the core and mantle are about equal in thickness, the core actually forms only 15 percent of the Earth's volume, whereas the mantle occupies 84 percent. The crust makes up the remaining 1 percent.
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pubs.usgs.gov/gip/interior/
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Hot dense ultramafic rock. Ultramfic is rock that is high in iron and magnesium and has almost no silica content
http://answers.yahoo.com/question/index?qid=20091004095...
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; CORE; The region just below the crust and extending all the way down to the Earth's core is called the mantle. The mantle is relatively flexible so it flows instead of fracturing.
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www.thetech.org/exhibits_events/online/quakes/inside/ma...
www.thetech.org/exhibits_events/online/quakes/inside/mantle.html
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; Beneath the mantle is the Earth's core. The Earth's core consists of a fluid outer core and a solid inner core. Because the outer core contains iron, when it flows it generates a magnetic field. This is the source of the Earth's magnetic field.
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www.thetech.org/exhibits_events/online/quakes/inside/co...
www.thetech.org/exhibits_events/online/quakes/inside/core.html
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Exploring the Earth's Mantle ... Seismologists noticed that records from an earthquake made around the world changed radically once the event was more than a certain distance away, about 105 degrees in terms of the angle between the earthquake and the seismograph as measured at the center of the earth.
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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 outer core is the layer beneath the mantle. It is made of liquid iron and nickel. Complex convection currents give rise to a dynamo effect which is responsible for the Earth's magnetic field.
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www.moorlandschool.co.uk/earth/earths_structure.htm
www.moorlandschool.co.uk/earth/earths_structure.htm
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