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The cause of loss of forest cover is:
The amount of insolation received at a place on the surface of the earth depends upon:
Ozone layer is formed due to reactions of:
In which of the following layer of atmosphere the absorption and scattering of the solar ultraviolet radiation takes place?
Humus is a type of:
In an iceberg floating in the sea, out of 10 parts of its mass, how much will remain above the surface of the water?
The final boundary between the Earth and the outer space is called .
Mangrove forests occur in:
The land which is not cultivated every year though it is suitable for cultivation:
Trees are leafless for a shorter or longer season of the year in: