Which type of mining is likely the least harmful to the environment?
a. surface mining
b. placer mining
c. subsurface mining
d. none of the above

Answer;

-Surface mining

Explanation;

-Mining involves the extraction of valuable minerals or other geological materials from the earth, commonly from an orebody, lode, vein, seam, reef or placer deposit. Despite having a large range of advantages economically, mining impacts the environment negatively because minerals are contained within the Earth. Earth must be removed in order to extract the minerals. When the minerals are close to the surface, the earth is removed, causing destruction to the shape of the land and the flora and fauna living in that area.

-Among different types of mining, surface mining is one of the method that greatly impacts the environment. It destroys all plant life in the area the mine occupies. Plants living in the area where the surface mine is to be located are removed. After the surface mine is no longer productive, plants may eventually return to the area, but typically some human efforts at reclamation are required to restore the environment to some level of productivity.

It's C. subsurface mining

Explanation: hope it helps ^w^

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the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.