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In this engineering activity, challenge learners to invent a water filter that cleans dirty water.

In this activity, learners consider the water features they might enjoy at a community park--a pond, brook, water playground (or "sprayground"), or pool--and what happens to the water over time.

In this activity on page 7 of the PDF (Water in Our World), learners make their own water treatment systems for cleaning water.

Water treatment on a large scale enables the supply of clean drinking water to communities.