Question

1. surface mining has all of these harmful effects except

a. surface miners may develop respiratory illnesses, such as black lung disease.
b. toxic substances, such as heavy metals, can be left behind in the soil.
c. nearby stream and river flows can be changed or blocked completely.
d. air pollution, specifically dust, occurs around the area.
e. water percolating through tailings can be contaminated.

Explanation:

Surface mining can lead to various harmful effects. Toxic substances like heavy metals can be left in the soil (A). Air pollution, specifically dust, can occur around the area (D). Water percolating through tailings can be contaminated (E). Nearby stream and river flows can be changed or blocked (C). However, it is impossible to completely block stream and river flows.

Answer:

C. nearby stream and river flows can be changed or blocked completely.