21.
Which one of the following is not a landform which results due to rejuvenation of a river?

22.
In which river is "Grand canyon"?

23.
A ship met with an accident at 30ºC and 35ºN. The ship was sailing in the ________

24.
The tides in the Sea are primarily due to

25.
When water freezes in the polar seas the salts ________

26.
Of the following the busiest oceanic trade route is ________

27.
Where is world's deepest trench "Mariana Trench" located?

28.
The average salinity of the sea water is ________ parts per thousand.

29.
Which of the following rivers falls into the Atlantic Ocean?
1. Orinoco
2. Danube
3. Amazon
4. Congo

30.
Sargasso sea is located in ________

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