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

How do scientists measure how clear or murky water in a lake is? How does water clarity (clearness) affect what lives in the lake?

In this activity, learners discuss the different salinities of oceans, rivers and estuaries.

In some parts of the world, lakes freeze during winter. In this activity learners will explore water’s unique properties of freezing and melting, and how these relate to density and temperature.

In this activity, learners investigate the different salinity levels of oceans, rivers and estuaries.

When it rains, water can collect on top of and seep into the ground. Water can also run downhill, carrying soil and pollution with it.

Lakes, streams and other freshwater bodies are a habitat for lots of living things, big and small.

Learners use a candle to investigate the products of combustion. When a glass rod is held over a lit candle, the candle flame deposits carbon on the rod.

In this activity (on page 14 of PDF), learners use a pan full of flour and some rocks to create a moonscape.

Plants need nutrients to grow. This is why we apply fertilizers to grass and food crops. In this activity, learners will explore how fertilizers can affect lakes and other bodies of water.

In this activity (on page 5 of PDF), learners use dry ice and household materials to make scientifically accurate models of comets.