A hole drilled into rock where explosives are placed to break up the rock during mining or construction.
From 'blast' (explosion) + 'hole' (opening). 'Blast' comes from Old Norse 'blása' meaning to blow. The compound emerged in the 19th century with industrial mining development.
Blastholes are arranged in precise mathematical patterns in mines—miners calculate angles and depths to create chain reactions that break rock most efficiently, turning geology into an explosive puzzle.
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