Extraction of minerals: Minerals can be extracted by mining, drilling or quarrying. The process of taking out minerals from rocks buried under the earth’s surface is called mining. Open-cast mining: Minerals that lie at shallow depths are taken out by removing the surface layer; this is known as open- cast mining.
Deep bores, called shafts, have to be made to reach mineral deposits that lie at great depths. This is called shaft mining.
Drilling: Petroleum and natural gas occur far below the earth’s surfaces. Deep wells are bored to take them out. This is called drilling.
Minerals that lie near the surface are simply dug out, by the process known as quarrying.
Coal mining in India at Raniganj in West Bengal in _______________________ | |||
Right Option : C | |||
View Explanation |
Rat hole mining is done in which of the following areas? | |||
Right Option : A | |||
View Explanation |
Mining occupation is well developed on the Chotta Nagpur plateau because of ____________ | |||
Right Option : B | |||
View Explanation |
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Abhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.