61.
The ocean surface currents follow clockwise circulatory paths in the northern parts of the Pacific and Atlantic oceans due to the ________

62.
Why are the ports of Baltic sea opened for trade in winter?

63.
The reason behind broadening the river valley is

64.
Which one of the following factors is responsible for the change in the regular direction of the ocean currents in the Indian Ocean?

65.
Imaginary lines connecting places in oceans having equal salinity are called

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