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Ports of the Baltic Sea remain open for trade even during winter because
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- It lies in the tropical belt.
- North Atlantic Drift, a warm ocean current flows in the region.
- Local winds keep it warm.
- Western disturbances cause abrupt rise in the temperature.
Correct Option: B
It is due to the North Atlantic Drift which is a warm water ocean current, an extension of the Gulf Stream. This current keep the ports along the coasts warm enough to stay open year around.
