Overview of the Earth in the Jurassic Period told by photos, news, videos, and external links with emphasis on what grew then, what lived then, the causes of mass extinction, types of fossils, and what life was like in general.

An overview of Walter and Luis Alverez's theory that a large meteorite crashed into earth causing huge tidal waves, showers of ash, and an enormous dust cloud.

Overview of the Earth in the Cambrian Period told by photos, news, and external links with an emphasis on what grew and lived then, the causes of mass extinction, types of fossils, and what life was like in general.

Overview of the Earth in the Devonian Period told by photos, news, and external links with an emphasis on what grew and lived then, the causes of mass extinction, types of fossils, and what life was like in general.

Explore life on ancient Earth with this site! Students can walk with dinosaurs to see what Earth looked like or investigate Earth's history. The site includes articles, pictures, timelines, and lots more.

This is an extensive learning module on biodiversity and its decline. It looks at ways biodiversity is threatened, the possibility of another mass extinction, the causes and consequences of habitat loss, factors that drive biodiversity...

"One of the great mysteries in science is the extinction of the dinosaurs at the end of the Mesozoic Era some 65 million years ago. Who (or more likely what) caused it is unknown and a subject of great debate." Many theories are touched...