7. Bijkomend materiaal

Hoofdstuk 3. De mondiale transportband

Antwoorden (in het Engels)

ice breaking tug with ship following Quandary of two Russian ports:   Why is the is the Arctic port of Murmansk ice free all year when ports near St Petersburg much further south are surrounded by ice for more than a month each year?

Answer:   The seas near Murmansk are warmed by relatively warm Atlantic water that flows into the Barents Sea via the Norwegian Current and North-Cape Current. The Baltic has no such influx of warm water, so it is much colder in winter.