High School

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__________ mining techniques usually don't permanently alter large surface areas, while ________ mining techniques usually do.

a) Surface; subsurface
b) Open-pit; underground
c) Drift; slope
d) Placer; solution

Answer :

Final answer:

Subsurface mining tends not to alter surface areas significantly, while surface mining does, as it involves stripping away layers of earth to reach minerals. Therefore, the correct answer is : (a).

Explanation:

Subsurface mining techniques usually don't permanently alter large surface areas, while surface mining techniques usually do. Subsurface mining, such as underground mining, involves extracting minerals from beneath the surface of the earth without removing the overlying rock to a great extent. In contrast, surface mining, including methods like open-pit mining, involves the removal of surface layers to reach mineral deposits, considerably changing the landscape.

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