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This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.

In this water pollution activity, learners create pond water cultures and investigate the effects of adding chemicals or natural nutrients.

In this activity (on pages 29-35), learners examine water pollution and filtration.

In this activity, learners act as water molecules and travel through parts of the water cycle to discover that it is more complex than just water moving from the ground to the atmosphere.

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