This Learning Web unit from the US Geological Survey offers an engaging, interdisciplinary exploration of caves for grades K-3. Although Exploring Caves is listed as a life science unit, it encompasses a wide range of fields: earth science, hydrology, mapping, biology, and anthropology. The unit is linked by an original read-aloud story about the adventures of two kids who get lost in a cave and...

Created by designer, illustrator, and educator Judith Ann Gorgone, the Planet Pals Web site provides good material for young kids related to the health of the planet. The colorful pages contain basic information about the earth, energy, recycling, water conservation, pollution, and more. The fun and interactive Meet the Planet Pals area is especially interesting, where kids can listen to animated...

Recycling made fun. The Environmental Protection Agency's Recycle City Web site offers students an interactive way to learn how recycling can affect their environment. Users can click any part of the cartoon drawing of the city to learn about that particular building or site and what can be done to decrease waste. The site also contains a more involved exercise called the Dumptown game, where...