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Answer :
Final answer:
Subsurface mining is likely the least harmful to the environment compared to surface and placer mining, as it typically results in less surface disturbance, although it still carries risks. Surface mining can cause severe habitat destruction, while placer mining can disrupt aquatic ecosystems. Understanding these impacts is crucial in evaluating the environmental consequences of different mining techniques.
Explanation:
Environmental Impact of Mining Types
The question regarding which type of mining is likely to be the least harmful to the environment involves understanding three different mining methods: surface mining, placer mining, and subsurface mining. Each has distinct environmental impacts.
Surface mining involves removing layers of soil and rock to uncover minerals, which can lead to significant habitat destruction and erosion. Placer mining, which extracts minerals from riverbeds, can disrupt aquatic ecosystems and lead to sedimentation. Subsurface mining, while less visually disruptive, can still cause land subsidence and pollution of groundwater through toxic chemicals used.
Among these options, subsurface mining is generally considered the least harmful method to the environment when compared to the other techniques, as it tends to leave less surface impact although it poses risks to subterranean water sources. Therefore, the best answer is c. subsurface mining.
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