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Why might surface mining be less risky for miners than underground mining? a. surface miners can become trapped in a collapsed mine. b. surface miners work in dusty, enclosed areas. c. surface miners work aboveground. d. surface miners use elevators to enter mines.

Indica el nombre y la fucion de los vasos sanguineos que entran y salen de los riñones

The deserts of the sahara and australia are associated with