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

In this biology activity (page 6 of the PDF), learners roll a die to create a simple model that teaches them about the factors contributing to heart disease.

This is an activity about turbidity, or the amount of sediment suspended in water.

Learners see convection currents in action in this highly visual demonstration. Sealed bags of colored hot or cold water are immersed in tanks of water.