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Answer :
Final answer:
Subsurface mining has less environmental impact than surface mining due to its smaller land footprint and the absence of acid mine drainage. However, it still presents risks to miners and can release hazardous gases.
Explanation:
The correct answer is a. Subsurface mining uses less than one-tenth as much land. Subsurface mining involves extracting minerals or resources from below the Earth's surface. Since it is done underground, it requires less land compared to surface mining, which involves removing large amounts of topsoil and rock.
Subsurface mining can also have less of an environmental impact because it does not produce acid mine drainage (option c). Acid mine drainage occurs when water combines with minerals exposed during mining and creates toxic water runoff that can harm aquatic ecosystems.
While subsurface mining may have less of an environmental impact in terms of land use and water pollution, it can still pose risks to miners such as exposure to air pollution (option d) and the release of hazardous gases.
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