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diatomaceous earth , diatomaceous earth (kieselguhr) Deposit composed of fossil diatoms (see BACILLARIOPHYCEAE), which is mined for many industrial uses: as a mild abrasi… Triangle (music) , triangle. Perc. instr. of indefinite pitch, made of metal shaped into a triangle and struck with metal stick to give tinkling sound. Much used by com… Rare-earth Metals , rare-earth metals
rare-earth metals
rare-earth metals, in chemistry, group of metals including those of the lanthanide series and actinide series and… Rammed Earth , rammed. Structure, e.g. wall, made by beating down earth contained between formwork or shuttering with a heavy implement. If cement and other strengt… Nonferrous Metal Industries , ALUMINUM, the most useful of the nonferrous metals, was first isolated in metallic form in 1825 by Hans Christian Oersted in Denmark. The metal remai… Metals , Metals
Metals are rarely encountered in their elemental state in nature. They must first be extracted from the ground as an ore, which is then treate…
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NEARBY TERMS
industrial mineral