Material Detail

In this activity (on pages 29-35), learners examine water pollution and filtration. First, learners build models of water bugs from paper clips, and test the effect of dirt and detergent on their "bugs" floating on the water. Next, learners build a water filter using filter paper, a paper towel, and gravel or sand. The "What We Know" section introduces concepts of how much drinking water is found on Earth, water pollution, the impact of pollution on water quality and surface tension���and how that affects specially adapted species such as water striders.

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