'Water, water everywhere but not a drop to drink'. This new activity investigates how to get clean water from dirty 'pond' water. Obtaining clean water to drink is a problem in many countries of the world. Pupils plan, carry out and evaluate a complete investigation, work out the necessary equipment to carry out their investigation and then clean the pond water as best they can. They will soon realise that the water will need further processing before it is suitable to drink. At the end of this activity, they should know that 'pond' water contains suspended solids (plants, rubbish, mud), soluble contaminants that they cannot remove in the classroom, and invisibles, for example, bacteria.This is a popular activity in the UK; do let us know how your pupils get on either by contacting us by email or by leaving a comment on this blog.
Earthlearningidea - - lots and lots of really good Earth-related activities!
1 comment:
I often use this as a 'challenge' activity. Where student teams compete to see who 'best' cleans the water. I offer the students a choice of possible items to filter and let them design their own filters using different layers. The biggest challenge is getting the blue food coloring out of the water. This exercise really works well with the cut off bottles as funnels. If you have a microscope students can easily see some of the small organisms in the water and you can incubate your own by putting grass clippings in water and letting it sit.
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