Question

what is the term for the harmful liquid that drains from subsurface mines that can contaminate surface water as well as groundwater?
sinkholes
placer mining
tailings
acid mine drainage

Explanation:

• Sinkholes are depressions in the ground, not a liquid.
• Placer mining is a mining method, not a harmful liquid.
• Tailings are the waste materials left after mining, often solid or slurry but not specifically the harmful liquid draining from subsurface mines that contaminates water.
• Acid mine drainage is the harmful liquid (acidic) that drains from subsurface mines and can contaminate surface and groundwater.

Answer:

D. acid mine drainage