A brief description of the four spheres of the Earth, with an activity where students brainstorm interactions among them.

This site from the UCMP Berkeley provides information about the Cretaceous Period, the last portion of the age of the dinosaurs and the continued break up of the continent of Pangaea.

Learn about the four types of deserts: hot and dry, semiarid, coastal, and cold with this key facts and information. Includes links to other biomes: aquatic, forest, grasslands, and tundra.

The Dinosauria provides the latest information about dinosaurs, including debunking myths, early dinosaur discoveries, characteristics of specific dinosaurs, life history, and discovery of dinosaur fossils.

This site provides a brief overview of the Precambrian Era and provides a clickable chart that breaks down this era into five different time frames. A lot of info is provided on each of the five.

An introduction to Darwin's theory of evolution with hyperlinks to other topics on evolution, including a timeline of evolutionary thought.

This site provides information about the geologic relationships of rock layers, as well as much about geologic time and the history of Earth.

A good brief review of The Cenozoic Era, which also includes links to more detailed information as well as a chart of its subdivisions.

Very good introduction to the biology of these little creatures. Includes good pictures and nice background information.

This is a lesson designed by a biology teacher. In it, students use maps and evidence of island age, molecular genetics, morphology, and distance apart to determine how the islands came to be occupied by different species of lizards. It will take some time and requires extensive background knowledge.

University of California site showcases how different types of organisms exist on the Earth and the history of life.

This is a very good introduction to the role evolution plays in the development of biodiversity. These topics and extinction are explained with the use of colorful interactive pictures.

A great beginner's guide to examining the nature of science. Covers the basics of how science helps us to understand the surrounding world.

Visit the virtual exhibits at this site to learn more about paleontology, the history of the earth, and life on earth. Use the information on this site to understand geology, geologic time, evolution, and phylogeny.

An excellent overview of the Paleozoic Era. It also provides a chart where you can learn information regarding each of the time frames within the era.

At this resource learners can take a look at the plant kingdom with a detailed examination of fossil records, life history and ecology, systematics, and morphology.

Provides hyperlinks to the history behind and the mechanisms driving plate tectonics. Be sure to click on the globe icons for animations of plate tectonics.

A basic description of the driving force behind plate movement. Describes major features of the ocean floor including mid-oceanic ridges.

An learning activity to help students grasp the concept of relative dating and geologic time.

This colorful, interactive site demonstrates how fossils can be used to discover a range of information about the past. Topics include Past Lives, Paleoecology, Geologic History, and Biodiversity.