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In this introduction to contrails, students explore both the origin and the three types of contrails. An indoor activity using tempera paint precedes outdoor observations and analyses of actual contrails. This is the 2nd of 3 sets of learning activities that are companion activities to the Elementary GLOBE children's book, "Do You Know That Clouds Have Names?" Includes a teacher implementation guide. GLOBE (Global Learning and Observation to Benefit the Environment) is a worldwide, hands-on, K-12 school-based science education program.