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
1. Orinoco
2. Danube
3. Amazon
4. Congo
30. Sargasso sea is located in ________
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