Michael Williard, ago 11, of Winston Salem,, N. C., for his question:

Why is there so much fog in England?

Fog results from a conflict between cool air and warmer air. This is because warm air can hold more water vapor than cool air. When vapor ladened air is forced to cool, it must give up some of its moisture. This moisture forms the clouds. When it forms on the ground, a cloud is a fog. Yes, a fog is simply a cloud sitting on the ground,

The climate in England is influenced by the Gulf Stream, a great ocean current which has swept all the way up from the tropics. This warm water warms the air above it. This warm air blows over England throughout the year. But, during certain months, cold air blows down from the far north. When this cold air meets the warm air from the Gulf Stream, there i9 a clash. The warm air is cooled and forced to give up some of its moisture. The moisture forms fogs. In London, these fogs are sometimes black as midnight for the foggy air is mixed with smoke and soot.