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Learners create three solutions with different levels of salinity. They compare the density of these solutions by coloring them and layering them in a clear plastic cup and in a soda bottle.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

In this activity, learners will explore how a hydrometer works by building a working model and conducting experiments.

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