The earths crust is on global average around 40 kilometres deep.The total diameter of the earth with approximate 12800 kilometres this appears to be rather shallow.
http://answers.ask.com/Science/Nature/how_deep_is_the_e...
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The Earth's Crust, Lithosphere and Asthenosphere ... The asthenosphere is ductile and can be pushed and deformed like silly putty in response to the warmth of the Earth. These rocks actually flow, moving in response to the stresses placed upon them by the churning motions of the deep interior of the Earth.
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www.windows.ucar.edu/tour/link=/earth/interior/earths_c...
www.windows.ucar.edu/tour/link=/earth/interior/earths_crust.html
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The movement of material deep within the Earth may cause large plates made of the crust and upper mantle, called the lithospheric plates, to move slowly over the Earth’s surface. It is also possible that these currents generate the Earth's magnetic field, called the magnetosphere.
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www.windows.ucar.edu/tour/link=/earth/Interior_Structur...
www.windows.ucar.edu/tour/link=/earth/Interior_Structure/interior.html&edu=high
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The continental crust has a depth of 0-75 Kilometers.
http://wiki.answers.com/Q/How_deep_is_Earths_crust
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Don't Eat the Earth's CRUST ... The Earth's outermost surface is called the crust. The crust is typically about 25 miles thick beneath continents, and about 6.5 miles thick beneath oceans. The crust is relatively light and brittle. Most earthquakes occur within the crust.
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www.thetech.org/exhibits_events/online/quakes/inside/cr...
www.thetech.org/exhibits_events/online/quakes/inside/crust.html
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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, and core) in more detail (see text).;
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pubs.usgs.gov/publications/text/inside.html
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Science this week has an important article on the first ever deep-sea drilling hole to manage to cross a major boundary in Earth's oceanic crust, into a deep crustal rock called gabbro that's never before been pulled from the location in which it formed.
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www.planetary.org/blog/article/00000581/
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Researchers Drill Mile Deep Into Earth's Crust, It's not quite the center of the Earth, but scientists have drilled nearly a mile into the planet's ocean crust, retrieving samples from the pristine layer of igneous rock for the first time. ... "This process covers 60 percent of the Earth's surface, ... New images from deep space...
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www.foxnews.com/story/0,2933,192500,00.html
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We can also have a more clear idea of the relations between the crustal stress and earthquakes, examine volcanic movements and resources lying deep beneath the earth's crust, as well as the origins of life and differences in climate around the globe," Xu said.
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english.people.com.cn/english/200003/01/eng20000301T102...
english.people.com.cn/english/200003/01/eng20000301T102.html
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