Which of the following characterizes acid mine drainage? 

A)  It neutralizes the pH of surface waters. 
B)  It enhances aquatic life. 
C)  It may contaminate groundwater. 
D)  It occurs when anaerobic bacteria produce nitric acid from nitrogen oxides.

Acid Mine Drainage

Acid mine drainage refers to the acidic water that emerges from mining operations, often containing high levels of toxic metals and pollutants that can cause extensive environmental damage.

Groundwater

Water that is held underground in the soil or in pores and crevices in rock.

Anaerobic Bacteria

Microorganisms that thrive in environments lacking oxygen, involved in processes like fermentation, wastewater treatment, and in the human gut flora.