The correct options that involved the risks are:
C. Both surface mining and underground mining risk causing severe water pollution.
D. Surface mining causes more destruction of land ecosystems than underground mining.
What is mining?
Mining is the extraction of valuable minerals from the earth.
Mining can be divided into four types:
Surface mining, underground mining, placer mining, and in-situ mining.
Surface mining is done near the surfaces of the Earth.
Underground mining is done deep earth.
Thus, the correct options are C and D.
Learn more about mining
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