weather [information over pictures] [rainfall] [1]

This activity is all about rainfall in the UK. The different types of rainfall, what causes it and why it is so unpredictable.	On average, it rains for 156 days each year in the UK. Rain is classified according to how it is created. There are three main types of rainfall.	The first type of rain is called frontal rain. It occurs where warm tropical air meets cold polar air as shown in this picture.
When these two large air masses meet, the warm less dense air, slides up over the cold dense air, creating the 'front'.	As a result, the warm, less dense air cools and the water vapour condenses into water and falls as raindrops.	Fronts are large scale weather systems, being hundreds, and possibly thousands of miles long, as seen here marked in blue.

Look at all of the pictures in turn. As you hover over each one a blue screen appears with an explanation of what the picture shows. Important words are highlighted. If you are certain that you know about the picture click on it and it will disappear. As you go through all of the pictures you will get rid of all those which you know about and be only left with those you may be unsure of. In some cases you may get rid of all of the pictures in which case you are ready to move on to other activities which will test your knowledge on that particular topic.