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A type of light-colored volcanic rock, rich in silica (63-68%)

Volcanic movements of rock including folding, shearing, compression and expansion

Removal or clearing of flora

Material used as an electrolyte to disperse mineral particles in a liquid

 An unintentional change in the course of drilling

A unit of temperature or angle

Damping an explosion

A gradually descending pathway in a mine, a ramp

The area used for loading personnel and tools into mine cage for descent or ascent

A mix of rock, water, and/or other materials