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This lesson was part of a unit on "Transportation" taught to third, fourth, and fifth graders in an after-school science program. It explores the effects that greenhouses gases, such as oil, coal, and gasoline, have on Earth's atmosphere. In this hands-on experiment, your student "scientists" will have the opportunity to work through the steps of the scientific method and collaboratively reach their own conclusions about the "atmosphere" they have simulated using a jar, a heat lamp/sun, a thermometer or temperature probe, and an Alka-Seltzer tablet. I have included data recording sheets and a simple drawing I used to initially assess my students' prior knowledge.