51.
The greatest known ocean depth (which lies in the Pacific Ocean) is ________

52.
Which one among the following best explains the reason for the eastern and western boundaries of the Pacific Ocean experiencing frequent earthquake?

53.
The oceanic current named as 'Kuroshio - Kurile and Alaskan' are located in

54.
Which one of the following cities is associated with the river Mekong ?

55.
The most important navigable river in, Central Europe that provides a link between seven countries-Austria, Belgium, Czech Republic, Hungary, Rome, Russia and Yugoslavia is ________

56.
Which of the following city is located on the banks of river Potomac?

57.
Which is the smallest among the following water bodies?

58.
Which one of the following conditions are not favourable for the growth of coral reefs ?

59.
Which among these Islands has coral reef?

60.
Which river has the largest drainage basin?

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