This lesson introduces students to the atmospheric differences between the three sister planets in a graphic and hands-on way. They should get an overall appreciation of the important similarities and differences. Students will understand that our two closest neighbors, Venus and Mars, have very different atmospheres than Earth does in pressure and chemical composition and will be able to explain the Goldilocks Principle and understand that Earth's moderate temperature is due primarily to its unique atmosphere. Students will use this understanding as they begin to appreciate the scope and importance of the greenhouse effect on Earth. The student guide has an overall description of the activity, the procedure, and observations and questions. The instructor guide contains detailed background material, learning goals, alignment to national standards, grade level/time, details on materials and preparation, procedure, assessment ideas, modifications for alternative learners, and a list of additional resources.
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