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Science - Make it rain

Science...

States of matter

 

This week in science, the children have 4 activities to choose from. Can you make it rain indoors with a small experiment, learn a song or take part in discussion tasks as they learn about the Water Cycle.

 

Activity 1 - The Song

Introduce the Water Cycle song (to the tune of ‘She’ll be coming round the mountain.’). The water cycle song, lyrics on the resource. https://www.youtube.com/watch?v=qrLEHV580Mg 

Full instructions can be found on the class page, as there is a lot of science around explaining the water cycle. 

 

Activity 2 - The Experiment - Can you make it rain indoors?

The attached resource has full instructions for the experiment. Can you record your observations with some pictures or a video?

 

Activity 3 - The Cold Glass Discussion

Using the resource picture page 5 and the discussion tips on page 6. Chn look at the Discussion Diagram (session resources) and discuss if they agree with the comments the characters are making. If possible, have a jug of iced water on the table and allow the chn to pour some into a clean, dry glass. What can they see? Where does the liquid water come from? Water vapour (gas) in the air. How can we use condensation?

 

Activity 4 - The Water Cycle Picture

Full instructions can be found on the class page, as there is a lot of science around explaining the water cycle. Can you discuss with the children? Use the weblinks to help:

http://www.bbc.co.uk/education/clips/z8qtfg8 - Class clips - simple explanation of the water cycle;

http://www.metoffice.gov.uk/learning/weather-for-kids/water-cycle - More complex explanation of water cycle using scientific language.

 

The children can then draw their own water cycle picture afterwards.

 

The Water Cycle recommended explanation

Show an enlarged copy of the Water Cycle diagram with no captions or labels. Begin with the rain and discuss with children what happens to the water: falls onto ground (precipitation) and runs off mountains and lower land into streams, which become rivers, which in turn empty into the sea. Some water ends up in lakes and ponds and some infiltrates the ground. Sun and wind cause evaporation and the warm air containing water vapour rises. As the air cools the water vapour condenses into water droplets which form clouds. These clouds get blown by the wind and they precipitate the water again as rain, particularly over higher ground. The cycle begins again. Look at animations about the Water Cycle (see weblinks).

 

Explain that the amount of water on the Earth remains the same; it is just being circulated between the oceans, land and atmosphere. The same water is used over and over again, so water the dinosaurs drank is still being used today! Discuss briefly why water is so important – refer to chn’s homework diaries to see the range of uses and how much we use!

 

Explain that water makes up 60 to 70% by mass of all living organisms, so it is essential that we drink enough to stay healthy and alive. Humans can live for a few weeks without any food, but only a few days without water – it depends on where you are and what you are doing, exercising in very hot weather or sitting quietly at room temperature. Plants need water for photosynthesis to occur and plants are part of all food chains, so our food depends on water. Water covers 75% of the earth’s surface, but fresh water makes up less than 3% of the water on earth. Over two thirds of this is in polar ice caps and glaciers, so there is not much available for us to use! 

 

Vocabulary
Evaporation, condensation, precipitation, transpiration, cycle, particle, temperature, change, evidence

 

Weblinks
Water cycle song from www.YouTube.com
Class clips - simple explanation of the water cycle from www.bbc.co.uk
More complex explanation of water cycle using scientific language from www.metoffice.gov.uk

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