Mercury
Links
KidsAstronomy.com: Mercury
http://www.kidsastronomy.com/mercury.htm
Explains the origin of its name in Greek mythology and provides details about its gravity and its moons.
Astronomy For Kids: Mercury
http://www.frontiernet.net/~kidpower/mercury.html
Includes a picture and brief facts about this planet.
Astronomy for Kids: Mercury
http://www.dustbunny.com/afk/planets/mercury/
Provides details related to location, visibility, size, origin of its name and surface.