9
Question
Which mining involves the digging out of minerals that occur on the surface of the earth?
Which mining involves the digging out of minerals that occur on the surface of the earth?
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Solution
The correct option is D Open cast
The
procedure of taking out minerals from rocks underlying under the earth’s
surface is called mining. Reserves that lie at petty pits are taken out by
removing the outside layer; this is known as open-cast mining. This type of
removal differs from extractive methods with the purpose of requiring tunnelling
into the earth such as longwall mining. It can extract minerals more rapidly.
The working conditions are safer for the miners because there is no risk of a cavern in or poisonous gas.
The correct option is A.
The procedure of taking out minerals from rocks underlying under the earth’s surface is called mining. Reserves that lie at petty pits are taken out by removing the outside layer; this is known as open-cast mining. This type of removal differs from extractive methods with the purpose of requiring tunnelling into the earth such as longwall mining. It can extract minerals more rapidly. The working conditions are safer for the miners because there is no risk of a cavern in or poisonous gas.
The correct option is A.
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