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What is the mean temperature of Earth?
The smallest ocean is:
A geyser is a spring which:
Taiga means:
In which of the following layer of atmosphere the absorption and scattering of the solar ultraviolet radiation takes place?
Man can maintain an ecological balance in the biosphere by:
The cause of loss of forest cover is:
The sea bed sloping gradually and bordering the continent is known as:
In a desert region, soil erosion can be checked by:
The soil conservation method in which mountain slope is cut into step is: