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

Learners observe working lava lamps to understand how they work (included in PDF link).

Focus sound through a balloon! In this Exploratorium activity, you'll use dry ice to create a balloon that's a sound lens.

This is a highly visual demonstration that illustrates both the effects of density and chemical reactions.

In this activity, learners explore the concept of density-driven currents (thermohaline circulation) and how these currents are affected by climate change.

In this activity, learners separate a mixture of pebbles, salt crystals, and wood pieces. They add water and pour the mixture through a strainer.

Learners measure a bottle full of air, and then use a vacuum pump to remove the air. When they re-weigh the bottle, learners find the mass is about 0.8g less.