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I would suggest to simply let them play with water and to explore the sensation of liquid, solid and gas. I was told yesterday by an UNESCO representative for the International Hydrology Project that the United Nations is studying making a difference between potable water and water for life, being the later the water that has the essential elements to sustain life; potable water not necessarily has them. Anyways, let the kids explore the properties of odorless, colorless and tasteless, then let them compare with dirty water and ask them to describe the difference. At the CBC in the early years of elementary kinder, 1st and 2nd we promote senses stimuli. Hope that this ideas work for you. My best regards,Juan Felipe Restrepo Mesa. Colegio Británico de Cartagena, Cartagena Colombia South America.
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