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Students will explore the difference between the three types of contrails. Then they will make observations of contrails outside, and record their observations. Fifteen minutes later they will make follow-up observations to see how the contrails they observed have changed. Uses commonly available or inexpensive materials (plastic cups, white tempera paint, paint brushes, blue construction paper, glue sticks, straws, posterboard or cardstock). 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.