Here is a fabulous instructional activity on the Earth's radiant energy system. This amazing, 31-page document is chock-full of great activities, worksheets, lab sheets, quizzes, rubrics, and assessments. Learners model and explain cloud formation, calculate incoming and outgoing radiation, identify aerosols in the earth's atmosphere, and make climate predictions. This is one of the finest educational resources I've come across! Highly recommended for your upper-elementary and middle schoolers.