7
Question
Which one of the following minerals are formed by the decomposition of rocks, leaving a residual mass of weathered material?
Which one of the following minerals are formed by the decomposition of rocks, leaving a residual mass of weathered material?
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Solution
The correct option is B Bauxite
Answer: The correct answer is option (b) – Bauxite
Bauxite
- Aluminium is obtained from Bauxite.
- India’s bauxite deposits are mainly found in the plateau region of Bilaspur-Katni, Maikal hills and Amarkantak plateau.
- Due to the decomposition of a wide variety of rocks rich in aluminium silicates, bauxite deposits are formed.
- Aluminium has great malleability, good conductivity. It is extremely light and combines the strength of iron.
Formation of Minerals
- Minerals are usually found in “ores”.
- An accumulation of any mineral mixed with other elements, is described with the help of the term ore.
- To make sure that extraction of minerals are economically viable, the mineral content of the ore must be in adequate concentration.
- The relative ease with which mineral ores may be mined is determined by the type of structure and formation in which they are found.
- This also helps in determining the cost of extraction.
Coal
- In India coal was mainly formed over 2 main geological ages. Some were formed about 55 million years ago are the tertiary deposits, some were formed during the Gondwana period, around 200 million years ago.
- West Bengal – Jharkhand (Damodar Valley) is the major source of Gondwana coal in India, these are metallurgical coal.
- Bokaro, Raniganj, Jharia are the important coalfields.
- Wardha, Son, Mahanadi and Godavari valleys are the other important locations for coal deposits in India.
- Nagaland, Arunachal Pradesh, Assam, Meghalaya are the North Eastern states where tertiary coals are located.
Bauxite
Answer: The correct answer is option (b) – Bauxite
Bauxite
- Aluminium is obtained from Bauxite.
- India’s bauxite deposits are mainly found in the plateau region of Bilaspur-Katni, Maikal hills and Amarkantak plateau.
- Due to the decomposition of a wide variety of rocks rich in aluminium silicates, bauxite deposits are formed.
- Aluminium has great malleability, good conductivity. It is extremely light and combines the strength of iron.
Formation of Minerals
- Minerals are usually found in “ores”.
- An accumulation of any mineral mixed with other elements, is described with the help of the term ore.
- To make sure that extraction of minerals are economically viable, the mineral content of the ore must be in adequate concentration.
- The relative ease with which mineral ores may be mined is determined by the type of structure and formation in which they are found.
- This also helps in determining the cost of extraction.
Coal
- In India coal was mainly formed over 2 main geological ages. Some were formed about 55 million years ago are the tertiary deposits, some were formed during the Gondwana period, around 200 million years ago.
- West Bengal – Jharkhand (Damodar Valley) is the major source of Gondwana coal in India, these are metallurgical coal.
- Bokaro, Raniganj, Jharia are the important coalfields.
- Wardha, Son, Mahanadi and Godavari valleys are the other important locations for coal deposits in India.
- Nagaland, Arunachal Pradesh, Assam, Meghalaya are the North Eastern states where tertiary coals are located.
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