23. Explain the three processes of extraction of minerals
Answers
Three process are :-
1) Mining :- In this process metals are extracted by diging the earth
2)Drilling :- in this narrow but deep drills are duged to extract the mineral.
3) Quarring :- in this metals are extracted for building process.
Answer:
(a) Mining: The process of taking out minerals from rocks buried under the earth's surface is called mining.
(i) Open Cast Mining: Minerals that lie at shallow depths are taken out by removing the surface layer is known as "Open Cast Mining".
(ii) Shaft Mining: Deep bores, called shafts, have to be made to reach mineral deposits that lie at great depth; this is known as "Shaft Mining".
(b) Drilling: Petroleum and natural gas occur far below the earth's surface. Deep wells are bored to take them out; this is called "Drilling".
(c) Quarrying: Minerals that lie near the earth's surface are simply dug out by the process known as "Quarrying".