Water Underground

Many people get water from a source deep underground, called groundwater. In this activity learners will make a model to explore this hidden water, and see how it connects to the other bodies of water. The model uses light-colored gravel in combination with red & blue colored water to allow learners to investigate the movement of groundwater and its potential contamination. Step-by-step instructions are included with photos along with safety recommendations. Activity guide includes a “What’s going on?” explanation and relevant connections to the importance of groundwater and pollution.

Materials List:

• Clear plastic bin (at least as large as a shoebox)


• Small white gravel, enough to fill about half of the plastic container


• Colander or strainer


• 1 L (34 oz) of water in a container


• 250 mL (about 8 oz of water in a separate container)


• Blue and red food coloring


• Soap dispenser pump, rinsed (pump only, not container)


• Tape (most kinds will work)


• Old pair of pantyhose or other thin stockings, or thin piece of cotton


• Scissors


• Rubber band


• 2 small, clear drinking cups