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The approximate circumference of the Earth is
A geyser is a spring which:
Best way to conserve our water resources:
Contour ploughing helps in:
The largest reservoir of fresh water is:
Man can maintain an ecological balance in the biosphere by:
The darkest portion of the shadow cast during an eclipse is:
The light from the Sun reaches the Earth in about—
Which of the following rivers lies in a rift valley?
In sea, plants are restricted up to the depth of: