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How can road crews use air to lift overturned trucks? This riddle asks students that question and provides them with a clue. They read about and view a video clip of two girls who investigate the question. One girl inflates a garbage bag in an attempt to lift the other child. On the riddle's final page, students select from three answer choices. Brief feedback is given for the incorrect options. When students select the best answer, a short video clip plays of that method. In it, a worker explains how air bags are inflated with a relatively low amount of air pressure to right a tipped semi. There's a link to a text-only version of the riddle. Copyright 2005 Eisenhower National Clearinghouse
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