A Kid's Heart: Earth Day: Offers printable puzzles, word searches, coloring pages, and story starters.
Billy Bear's... It's Earth Day: Includes games, craft ideas, online greeting cards, and information about protecting wildlife.
CNN: Earth Day for Kids: Features open-web quiz and suggestions for taking care of the earth.
DLTK's Crafts for Kids - Earth Day: Offers printable templates for children's Earth Day crafts. Suitable for preschool, kindergarten, and gradeschool kids.
Earth Day at Kid's Domain: Adopt a rainforest animal, learn the history of Earth Day, play online games, sing earth songs, download a coloring book. Also offers crafts, recipes, and stories.
Earth Day at PrimaryGames.com: Offers coloring pages, printable stationery, musical postcards, and links.
Earth Day Every Day: Includes a history of the observance, environmental timeline, a virtual tour of an arctic wildlife sanctuary, a collection of activities just for kids, and resources for teachers. From the Wilderness Society.
Earth Day History: Detailed history as related by Earth Day's founder John McConnell. Includes a complete copy of the resolution that proclaimed the first Earth Day.
Earth Day On Your Block: Celebrating Earth Day in the neighborhood with activities and projects; lists ideas and resources.
Earth's Birthday Project: Features kid-friendly facts about bugs, critters, and different environments. Also includes hands-on classroom activities.
EcoKids: Earth Day Activity Ideas: Games, printables and ideas for observing the occasion from Earth Day Canada.
Happy Earth Day Coloring Book: Offers downloadable 11-page coloring book from Environmental Protection Agency. In .pdf format.
International Earth Day Site: The official site with information on events, history, proclamations.
Kids For Saving Earth: Educates, inspires, and empowers children to protect the earth's environment.
Lorax's Save the Trees Game: Interactive game to help celebrate Earth Day.
Make a Rain Stick for Earth Day: Directions for simple craft project.
NIEHS Kids Pages: Environmental games, science, puzzles, and research. Also in Spanish. From the National Institute of Environmental Health Sciences.
Planetpals Earth Day: Features the history of Earth Day, along with crafts, games, and many educational activities.
What and When is Earth Day?: Short history of Earth Day.