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A heavy, dense and rare, silvery-white precious metal. Symbol, Re

The heaviest radioactive gas element, symbol, Rn

Land adjacent to a large waterbody, connected in the same watershed

A uranium prospecting technique which detects traces of radon gas

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