Missouri Botanical Gardens' Biomes of the World - Colorful photos, explanations, and geographical information make this site a great content site for learning about the regions of the earth. Each biome section contains information about plants and animals in the region as well as interesting facts. Freshwater and Marine ecosystems are included!

Cornell University's "Discover Our Earth" - Learn about plate tectonics, topography, volcanoes, and earthquakes. Discover Our Earth has sections for students and teachers to allow you to plan a complete unit on the earth's geological features. Colorful graphics and photos make help visual learners retain information.

United States Geological Survey's Earthquakes for Kids - Everything anyone could need or want to know about earthquakes including recent quakes, questions and answers, online activities, articles, and more. There isn't much a child could want to know about earthquakes that wouldn't be covered here!

Cascades Volcano Observatory's "Learn About Volcanoes" - As a geological feature of our earth, volcanos are interesting to study. Questions about volcanoes are answered by geologists and photographs provide visual appeal. This site has a linear learning unit that students navigate using a "next" button. To see where volcanoes in the USA are located, use this interactive map which links back to the USGS site.