In this activity, students work in groups, plotting carbon dioxide concentrations over time on overheads. They are asked to estimate, from their plots, the rate of change over five years. This Starting Point site details the carbon dioxide activity and highlights its learning goals and context, downloadable teaching materials, and additional links to references and resources. Full description.

This site displays a click-and-zoom map of the US showing forecast temperatures as well as several other meteorological variables, normally updated every hour. Also available are maps showing chance of precipitation, temperature and wind, weather, dew point, weather, precipitation, dew point and cover. Maps can be changed to see forecasts for the current day, that night, and three days following. ... Full description.

The NEXRAD National Mosaic Reflectivity site allows users to search for reflectivity images by date. Daily images are available for 1 April 1995 to 18 April 1997, and hourly images are available for 19 April 1997 to 22 March 2004. The images are clickable maps that allows users to zoom in and out of the United States reflectivity images. Full description.

This site provides users with a friendly web-based interface for visualization and analysis of Tropical Rainfall Measuring Mission (TRMM), gridded rainfall products and other precipitation data. It is applicable to variety of researches and applications, such as climate study and monitoring, weather events study and monitoring, agricultural crop monitoring, rainfall algorithm study, and data products ... Full description.

This MS Word document explains roles for a Planetary Climate role-playing exercise dealing with the atmospheres of Venus and the Earth. Roles include experts on coal, carbon dioxide, heat balance, spectroscopy, atmospheric transmission and the water cycle. Full description.

This website is a well-illustrated description of Snowball Earth controversy. The description includes an introduction, background information, arguments for and against snowball earth, figures and tables, discussion and conclusions as well as references. This is a useful site for a comprehensive description of the Snowball Earth theory. Full description.

The proceedings of the Geological Society of America, Earth System Processes, Global Meeting include a session titled The Snowball Earth Hypothesis: Theory and Observations. This website contains links to the session's abstracts as well as a link to the full meeting schedule. Full description.

This Science Daily article summarizes a paper in Geology pertaining to the Snowball Earth debate. The author found evidence for healthy marine ecosystems at a time when they were supposed to be completely frozen over and anoxic. The website also contains a great search engine used to other Snowball Earth articles. Full description.

This website contains an informational paper by Paul Hoffman and Daniel Schragg at Harvard University. The paper describes many lines of evidence supporting a theory that the entire Earth was ice-covered 600-700 million years ago. Each glacial period lasted for millions of years and ended violently under extreme greenhouse conditions. These climate shocks triggered the evolution of multicellular animal ... Full description.

This site from SERC's Starting Point presents sample Gallery Walk questions about weather map interpretation. Students explore several weather parameters including fronts, pressure cells, and precipitation. Groups synthesize various weather variables, create a weather forecast, and present the material in either an oral or written assignment. The questions are organized according to the cognitive ... Full description.