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Mining
Of or pertaining to the process or business of extracting materials, such as ore or minerals, from the earth's crust.
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alpha-particle
Astronomy; General astronomy
1) Nucleus formed by the α-process (q.v.) (see even-even nuclei.) 2) Particle first discovered in radioactive α decay, and later identified as helium nuclei (two protons and two ...
actinium
Astronomy; General astronomy
soft, silvery-white, radioactive metal which glows in the dark
