weather [wind] [1] [information over pictures]

As you know the Earth rotates on its axis which is tilted at 23.5 degrees.	The Sun's rays hit the Earth and some of that solar heat is trapped in Earth's atmosphere.	Due to the tilt the solar heat is unevenly spread over the surface of the Earth. It is especially concentrated at the equator.
The warm air rises and moves into the colder air above. This is what causes clouds which is covered in other topics.	So you have warm air rising into cold air and a rotating Earth on a tilt. Here you can see the red warm air at the equator, the pink colder air in the tropics, and the blue cold air at the poles.	Wind is the movement of air bewteen these areas. This animation shows this movement and future wind topics will cover this in greater detail.

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 coloured. 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.