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A trace radioactive element, symbol, Ra. It occurs in uranium ores

Marine protozoa subject to silica replacement fossilization sound in limestone, shale and other rocks

Lines converging at a single center

Alpha, beta or gamma energy emitted by the decay of atomic nuclei from their radioactive source

A fine-grained, extrusive igneous rock, having parallel mineral composition with granite

A shaft or room that has been excavated from the ground upward

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