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The longest river in Asia is:
The soil which originate under tall-grass prairie vegetation is called:
What process takes place during the youthful stage of a river?
Best way to conserve our water resources:
‘Green House Effect’ means:
Most of the devastating earthquakes are usually caused by:
Which among the following ecosystem have inverted biomass pyramid?
Pyramid of numbers in an aquatic ecosystem is .
Which of the following is the newest geological era?
The deepest surface depression on the earth is: