PBS
Pbs Learning Media: Global Warming: Graphs Tell the Story
Examine these graphs from the NOVA/ FRONTLINE Web site to see dramatic increases in the temperature of Earth's surface and greenhouse gases in the atmosphere.
Idaho State University
Global Wind Systems [Pdf]
A great description of the global scale circulation and heat energy. Discusses a single-cell model, a three-cell model, jet streams and more.
NASA
Nasa Star Child: The Planet Mercury
Basic facts about the planet Mercury including its size, its name, and its atmosphere. Includes a discussion question on its visibility from Earth, with facts, and the answer. A linked page covers similar material in a "Level 2" version,...