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

In this activity, learners receive a labeled plastic film canister containing a material representing a pollutant (i.e. pencil shavings = a beaver's wood chips).

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

How do scientists measure how clear or murky water in a lake is? How does water clarity (clearness) affect what lives in the lake?