African rift valleys were formed by the separation of tectonic plates. Water flows down to the valley floors, creating rivers and lakes.
A short article by Dr. Sean B. Carroll detailing the discoveries covered in the film The Day The Mesozoic Died.
Microbes have been the dominant life form throughout Earth's history. Eukaryotes and animals evolved only after microbes evolved oxygen-generating photosynthesis.
Students discuss the short film after a screening at the 2012 Holiday Lectures on Science.
Dr. Lyson describes dinosaur digs as well as his focus on prehistoric turtle fossils.
The record of life on Earth stretches over 3 billion years. Deep time and Earth history are keys to understanding the present.
Earth's climate is a complex system controlled by many factors. This Click and Learn will examine the two most important factors: solar radiation and the composition of Earth's atmosphere.
Tiktaalik roseae, also known as the “fishapod,” is an animal that lived about 375 million years ago, with features of fish and four-legged animals.
The fossils of transitional creatures were key evidence for Darwin’s evolutionary theory, but none had been found when he published On the Origin of Species. Now, there are many examples of such fossils, which clearly show that big evolutionary leaps consist of many smaller steps.
Prehistoric extinction rates are calculated from fossil data in a paleodatabase and compared to today’s extinction rate.
The following classroom-ready resources complement The Day the Mesozoic Died, which tells the story of the extraordinary detective work that led to the stunning discovery that an asteroid struck Earth 66 million years ago, triggering a mass extinction of animals, plants and even...