Question

Which statement is true about the potential environmental impact on local water by both surface and underground mining?(1 point)
Responses

Both types of mining lead to overburden clogging small local waterways.
Both types of mining lead to overburden clogging small local waterways.

Both types of mining cause high risk of sediment runoff.
Both types of mining cause high risk of sediment runoff.

Both types of mining can lead to a lowered water table.
Both types of mining can lead to a lowered water table.

Both types of mining can cause acid and heavy metals to get into local water.

Answer 1

Both types of mining can cause acid and heavy metals to get into local water.

Explanation: both surface and underground mining can expose sulfide-bearing rocks (e.g., pyrite) to air and water, producing acid mine drainage that mobilizes heavy metals into surface water and groundwater.