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Learners discover that soap can be used to power a boat. Learners make a simple, flat boat model, put it in water, and then add a drop of detergent at the back of the boat.

Many people get water from a source deep underground, called groundwater.

Glare from the sun and ripples from the wind can make it hard to see what's below the surface of a body of water.

Where rainwater goes after the rain stops? And why there are rivers and lakes in some parts of the land but not in others?

In this activity, learners make a model of a one-way heart valve to investigate how a heart controls the direction of blood flow.