Continental Divide: The Breakup of Pangaea

Examine geological evidence found in fossils, rock deposits, and ancient mountains that supports the theory of continental drift in this interactive activity adapted from the Exploratorium.

Deep Time

This interactive timeline from Evolution offers a visual representation of the major geological changes, transformations, and extinction episodes in the 4.6-billion-year history of Earth.

Fish with Fingers

In this video segment from Evolution: "Great Transformations," paleontologist Jenny Clack explains that vertebrates evolved fingers before they invaded land.

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The Grand Canyon: Evidence of Earth's Past

In this video segment adapted from NOVA, a fossil found among the Grand Canyon's rock layers reveals the existence of a shallow sea that once covered most of western North America.

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Great Ocean Conveyor Belt: Part I

This image from GRID-Arendal depicts the major circulation pattern of the ocean, illustrating interactions between temperature, salinity, and depth.

Greenland Ice Sheet Project 2: A Record of Climate Change

Using images and graphs, this interactive resource illustrates scientists' efforts to study Earth's climatic history for the last 250,000 years by drilling into the Greenland Ice Sheet and examining ice cores. Adapted from the Wright Center for Science Education, Tufts University.

Life Before Oxygen

This Interactive NOVA: "Earth" video segment looks at ancient organisms that lived anaerobically, the origins of photosynthesis, and the new forms of life this process made possible.

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Mountain of Ice: If the Ice Melts

This interactive resource adapted from NOVA Online features a collection of images that show what would happen to selected coastlines around the world if the Antarctic Ice Sheet melted.

Natural Climate Change in Djibouti, Africa

In this video segment adapted from NOVA, animations are used to illustrate how change in the tilt of Earth's axis produces dramatic climate change over thousands of years.

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Once and Future Tsunamis

In this interactive world map from NOVA Online explore nine key tsunamis dating from 3.5 billion years ago and discover what experts have learned from studying them.

Taking the Earth's Temperature

This video segment from FRONTLINE/NOVA: "What's Up with the Weather?" depicts research efforts to record Earth's past and present temperatures shifts.

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Ted Daeschler and Neil Shubin: Early Tetrapod Fossils

In this transcript of an interview filmed for Evolution: "Great Transformations," Ted Daeschler and Neil Shubin describe the discovery and significance of some of their key fossil finds.

Transitional Tetrapod Fossil

In this video segment from NOVA: "Judgment Day: Intelligent Design on Trial," learn about the discovery of a well-preserved transitional fossil and how such transitional fossils support the theory of evolution.

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The Wall of Time

This illustrated timeline from the Lunar and Planetary Institute provides a journey through four-and-a-half billion years of time from the birth of our solar system to its current existence today.

What Killed the Dinosaurs?

This Evolution Web feature uses animations to explore how evidence can support a variety of hypotheses surrounding the mystery behind the extinction of the dinosaurs.

When Did the First Americans Arrive?

In this video segment adapted from NOVA, recent archeological evidence leads scientists to revise existing theories about human migrations into the Americas around the time of the last ice age.

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