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As a group, learners consider sources of water pollution to understand where pollution starts and where it ends up.

In this design challenge activity, learners add headphones to a previously built instrument (see "Build a Band" activity) to make it easier to hear.

Learners take a field trip along a local body of water and conduct a visual survey to discover information about local land use and water quality.

In this experiment, learners examine the way oil affects bird feathers and test different cleanup methods to find out which works best.

In this web-based activity, learners try to figure out who in an online chat room has their matching puzzle piece.

In this lesson, learners will understand the concepts behind endangered and extinct animals and develop their own conservation plan to save three endangered species.

In this activity, learners explore the engineering and principles behind working elevators.

In this lesson, learners will practice graphing and statistically analyzing data.

In this activity, learners light an LED with five cents. Learners use two different metals and some sour, salty water to create a cheap battery.

In this activity (on pages 20-23 of PDF), learners build a model of a power plant using simple materials.