Word: copper-nickel
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...When the water evaporates through the leaves, the minerals it carried remain in the plant's tissues, eventually falling to the ground and becoming part of the humus on the surface. Geophysicists analyze this "biologically enriched" layer and the leaves of growing plants. Finnish geochemists found a rich copper-nickel deposit by examining the ashes of birch leaves...
...Copper-nickel alloys, said Dr. Paul Dyer Merica of International Nickel Co., are now prepared by heat treatment to stand a pull of 175,000 Ib. per sq. in., a tensile trength comparable to that of heat-treated steel...
...Konel metal is not to be confused with monel metal, a copper-nickel alloy (plus small amounts of iron, carbon, manganese, silicon) developed in 1905. Monel metal is relatively soft, is valuable for its corrosion-resisting properties...