An ice core is a vertical column through a glacier, sampling the layers that formed through an annual cycle of snowfall and melt. As snow accumulates, each layer ...
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احصل على السعرBeryllium: Beryllium (Be), chemical element, the lightest member of the alkalineearth metals of Group 2 (IIa) of the periodic table, used in metallurgy as a ...
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احصل على السعرCopper: Copper, a chemical element that is a reddish, extremely ductile metal and an excellent conductor of electricity and heat.
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احصل على السعرPhotographs and descriptions of many samples of the element Copper in the Periodic Table.
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احصل على السعرThe Guide to Greener Electronics is an analysis of what 17 of the world's leading consumer electronics companies are doing to address their environmental impacts.
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