water cycle [information over pictures]

These notes are about the Water Cycle. Explaining how seawater becomes rainwater and runs back into the sea as freshwater.	Stage 1 is called EVAPORATION. As the Sun heats up the surface of the sea it begins to change the liquid into a gas called water vapour. This process is called CONVECTION.	Stage 2 is called CONDENSATION. This is when the water vapour [gas] begins to rise but cools as it does so. The cooling water vapour begins to form into clouds.
Stage 3 is called PRECIPITATION. As the clouds are blown on-shore they have to rise. As a result the water vapour begins to cool and changes back into a liquid. This falls as rain, sleet or snow depending on the temperature.	Stage 4 is called RUN-OFF. As you know the water always flows downhill. In the hills it starts as a trickle which form into streams, which in turn become rivers and eventually flow back into the sea.	This animation shows all 4 stages. 1.EVAPORATION 2.CONDENSATION 3.PRECIPITATION 4.RUN-OFF You may notice that the trees are also giving off water vapour. This is called TRANSPIRATION.

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.