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oopsydaisy
Of all excavation hazards, a cave-in poses the greatest risk of all. This could be fatal to a worker. The correct answer is A, a cave-in. 
WorldlyGlass49
Of all excavation hazards, A. a cave-in possesses the greatest risk.
When there is a cave-in, the walls of a cave crumble and may close the exit of the cave, thus preventing workers from leaving it safely. Rocks may also fall from the ceiling and injure, if not kill somebody.