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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