Tamara Oakley, age 10, of Newport News, Virginia, for her question:

Why is London so damp and foggy?

The people who live there will tell you that London town is not always a damp and foggy place. Sometimes the sun shines bright and clear for days and days. But let's face it, during the year those poor people do get more than their share of damp, foggy weather. And, naturally, there is a reason for it. The same thing happens in other places where warm ocean winds blow over the cooler land. Most fogs form when masses of warm moist air meet masses of cooler air.

The westerly winds blow across the Atlantic to England. Most of the North Atlantic is cold and stormy. But around it circles a warm ocean current called the Gulf Stream and the Gulf Stream sweeps around the shores of England. It brings warm water and warm moist winds. When these winds reach the land, sometimes they bash into cool, drier air. This weathery collision causes fogs to form over London    and also in other parts of England. .