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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

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

Samples large enough to contain a similar percentage of mineral constituents of the host rocks from which it was removed

Rocks transformed by the replacement of eroded or precipitated minerals, by the introduction of newly deposited minerals and while retaining a high percentage of its original form

The time lapse between volcanic eruptions