Coal used for the generation of electricity through combustion
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Tag: <span>T</span>
A heavy, silvery-white metal. Symbol, Tl
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
A volcanic eruption subject to glacial exposure at surface
The state of reduced clarity of liquid, due to the concentration of suspended sedimentary or other particles
A large tunneling machine capable of drilling large tunnel and room sizes passages in solid rock
An opening and passage into a mine
A hard, brittle, metal. Symbol, W