31.
Niagara Falls are in ________

32.
Which is the largest reservoir of sweet water?

33.
The stagnated water in the surface of lake is known as

34.
Which of the following is the largest river in the world?

35.
The Caspian Sea, the largest inland sea or lake in the world, is located ________

36.
Which of the following river crosses Tropic of Capricorn twice?

37.
Which if the following river crosses the Equator twice.

38.
Which river crosses the Equator twice?

39.
Coral reefs are formed by ________

40.
Which of the following separates Asia and North America?

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