The heaviest radioactive gas element, symbol, Rn
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Category: <span>R</span>
Land adjacent to a large waterbody, connected in the same watershed
A uranium prospecting technique which detects traces of radon gas
The extent of mineralization by size and value, calculated by sound volumetric procedures
A tetragonal mineral and ore of titanium, TiO2
A silvery white, hexagonal platinum group metal. Symbol, Ru
Water that drains from a flood plain, or higher structure into streams, rivers, or other channels
The red, gemstone variety of corundum Al2O3. Sapphires represent the blue variety of the same substance
A soft, silvery-white, metal. Symbol, Rb
A loose mass of rock fragments