NOAA
Noaa: Satellites in Orbit [Pdf]
Construct a model that helps to show how satellites stay in orbit around the Earth. Then see how a flashlight can help explain how a satellite can send messages to different locations.
NOAA
Noaa: National Weather Service: Remote Sensing
The National Weather Service presents this site on remote sensing. Learn about Doppler radar, the Automated Surface Observing System (ASOS), and radiosondes. Review questions included.