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Encyclopędia Britannica
aluminum (Al)
also spelled Aluminium chemical element, a lightweight, silvery-white metal of
main Group IIIa (boron group) of the periodic table. Aluminum is the most
abundant metallic element in the Earth's crust and the most widely used
nonferrous metal. Because of its chemical activity, aluminum never occurs in
the metallic form in nature, but its compounds are present to a greater or
lesser extent in almost all rocks, vegetation, and animals. Aluminum is
concentrated in the outer 10 miles (16 km) of the Earth's crust, of which it
constitutes about 8 percent by weight; it is exceeded in amount only by oxygen
and silicon.
from Encyclopędia Britannica Premium Service.
<http://www.britannica.com/eb/article?eu=6036>
[Accessed October 4, 2003].
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