Explanation:

When the warm and the cold currents meet, dense fog is created. This is because air above the warm currents is warm which contains water vapour. When this warm current meet the cold current, the air above the cold current, causes the water vapour of the warm current to condense into tiny particles which form fog.

Deep-ocean currents are caused by differences in water density. The process that creates deep currents is called thermohaline circulation—“thermo” referring to temperature and “haline” to saltiness. It all starts with surface currents carrying warm water north from the equator. The water cools as it moves into higher northern latitudes, and the more it cools, the denser it becomes. This is the start of what scientists call the “global conveyor belt,” a system of connected deep and surface currents that moves water around the globe. 

Northern Canda is colder than Europe despite similar latitudes because, Europe experiences warm ocean current: North Atlantic Drift an extension of Gulf Stream. North Canada is marked by Labrador Current, while the eastern Canada has favourable fishing area because labrador current (cold) and gulf stream (warm) meet.