46.
Fishing grounds are concentrated in the high latitudes. The reasons are:
1. great length of indented coastline
2. extensive continental shelves
3. water temperatures lower than 20°C
4. sparse population

47.
The Kiel Canal links the ________

48.
The deepest surface depression on earth is

49.
Major source of oceanic salinity is

50.
The deepest trench of the Indian Ocean is

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