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In this activity, learners consider the water features they might enjoy at a community park--a pond, brook, water playground (or "sprayground"), or pool--and what happens to the water over time.

In this activity, learners explore how engineers work to solve the challenges of a society, such as delivering safe drinking water.

In this engineering activity, challenge learners to invent a water filter that cleans dirty water.

In this activity, learners use sieves with different-sized holes to sort balls by size.

In this activity, learners explore how civil engineers solved the challenge of moving water via irrigation.

In this activity (on page 2 of PDF), learners create a low-tech refrigerator that requires no electricity to keep food from spoiling.

In this activity, learners investigate the food, water, and space needs of common livestock animals.