This web site, created by the National Center for Atmospheric Research (NCAR) in collaboration with teachers, contains teacher-crafted classroom activities designed to enhance middle schoolers' skills in science and math. "Cycles of the Earth and Atmosphere" builds the excitement of scientific discovery into the curriculum, along with the basic concepts middle school students are expected to master. Topics include climate, the greenhouse effect, global climate change, the ozone, and the atmosphere as a whole. Each section provides background materials and several classroom activities that let students become hands-on participants in the scientific discovery process. One animation on the site demonstrates

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