Mode of Occurrence of Minerals


 
 
Concept Explanation
 

Mode of Occurrence of Minerals

Mineral and power resources are vital for the economic and industrial progress of a nation. Their distribution on the surface of the Earth is highly uneven. The presence or absence of mineral and power resources can have a powerful influence on the relative wealth and economic independence of a country. Naturally occurring substance that has a definite chemical composition is a mineral. Minerals are not evenly distributed over space. They are concentrated in a particular area or rock formations. Some minerals are found in areas which are not easily accessible such as the Arctic Ocean bed and Antarctica. Mineral are formed in different types of geological environments, under varying conditions. They are created by natural processes without any human interference. They can be indentified on the basis of their physical properties such as color, density, hardness and chemical property such as solubility. Minerals are rarely found in the pure state. They are usually found in rocks, combined with other elements. Most minerals are found in such low concentration or in inaccessible place, that their extraction become too expensive or technically difficult, to be profitable. A rock which contains enough mineral to make it economically suitable for mining is called an ore.  

Ores are classified as high grade ores and low grade ores. In the high grade ores the mineral content is high and impurities are less. In the low grade ores mineral content is low and impurities are more.

Sample Questions
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Question : 1

Minerals are deposited and accumulated in the strata of which of the following rocks?

Right Option : C
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Question : 2

A period of the Earth's geological history which is about 55 million years old was ________________________

Right Option : C
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Question : 3

A period of the Earth's geological history which ia about 55 million years old was ______ .

Right Option : C
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