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Pertaining to the movement of structures within the Earth’s crust

A heavy, brittle metal. Symbol, Ta

Rock broken from the upper reaches of a mountain or cliff

A pond or cavity used to allow the settling and possible neutralization of tailings material

Ore material leftover from initial processing

A crystal form of four, equilateral triangle faces

A crystal structure having three symmetrical sides, alone or series

The period following the Cretaceous, from 65 to 1.8 million years ago

The period in time from 245 – 208 million years ago

Any material deposited by pyroclastic movement