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El Nino occurs over:
The pole star indicates which direction?
The surface temperature of the sun is estimated as:
Widening of a river valley takes place due to:
‘Green House Effect’ means:
How much of the Earth’s land surface is desert?
The west to east extension of the Himalayas is from:
Desertification can be checked by
A natural region has the similarity of:
Sea water is saltier than rain water because: