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As a model of acid rain, learners water plants with three different solutions: water only, vinegar only, vinegar-water mixture.

Learners observe and discuss a simple model of a wet scrubber, a device for cleaning industrial air pollution.

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

In this activity, learners build one or more edible coral polyps and place them together to form a colony.

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?