In addition to lowering the pH of nearby streams, which of the following is an environmental problem associated with acid mine drainage?

A. acidic runoff causes aquifer materials to dissolve
B. chemical burns of workers due to presence of alkaline minerals
C. increased runoff leading to more frequent flooding
D. release of heavy metals into the environment
E. erosion of mining tunnels causing land subsidence


Answer: D

Environmental & Atmospheric Sciences

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