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In the 1970s there was interest in developing wind power because of _____________.
__________is the extraction of valuable minerals or other geological materials from the earth.
What is meant by conventional energy resources?
Energy produced by the breakdown of organic matter in the absence of oxygen is called
The plants which use cattle dung are called________.
The final product of this fermentation process is biogas with methane as the main ingredient. But aggressive hydrogen sulphide is also contained in the biogas. The residues can be utilised as high-quality fertilisers. The biogas generated is stored in the tank’s roof, and from there it is burned in the combined heat and power plant (CHP) to generate electricity and heat. The heat generated can be utilised to heat buildings or to dry wood or harvest products.
The potential of non-conventional energy in India is estimated to be about ______________.
_____ is an example of a non-metallic mineral.
Why has quarrying become a significant environmental concern?
The process of taking out minerals from rocks buried under the surface of the earth is named as
Gold is an example of minerals.
Which continent is the largest producer of iron?
Which one of the following countries in Europe has the largest deposits of iron?
Which is one of the deepest gold mines of the world?
Petroleum is referred to as ‘black gold’ because
Where do we find natural gas resources in India?
Energy obtained from the earth is known as:
______ produces more than half of the world’s tin.
To reach mineral deposits at great depths, deep bores have to be made. This process is called _____
Minerals found in ______ are not accessible.
The South American country which boasts of mineral oil is