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nickel

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core

Overview page. Subjects: Environmental Science.

1 The central part of the Earth, the core is the point within the Earth where S-waves cannot penetrate, marked by an abrupt increase in pressure. It is believed to be composed...

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manganese nodule

Overview page. Subjects: Earth Sciences and Geography — Ecology and Conservation.

A small, rounded concretion that is found on the deep ocean floor and may contain up to 20% manganese and smaller amounts of iron, copper, and nickeloxides and hydroxides.

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rhodium

Overview page. Subjects: Chemistry.

Symbol Rh. A silvery-white metallic transition element; a.n. 45; r.a.m. 102.9; r.d. 12.4; m.p. 1966°C; b.p. 3727°C. It occurs with platinum and is used in certain platinum alloys (e.g. for...

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trace metal

Overview page. Subjects: Environmental Science.

A metal (such as cadmium, copper, chromium, mercury, nickel, lead, and zinc) that is naturally found in extremely small quantities in animal and plant cells and tissue but is necessary for...

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