CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY CHRISTIAN DARKIN / SCIENCE PHOTO LIBRARY
Cretaceous Earth. Computer artwork of the position of Earth's continents in the Cretaceous Period, which began around 146 million years ago and ended with the extinction of the dinosaurs 65 million years ago. The continents are slowly moved over the surface of the Earth by currents in the fluid mantle below the crust. Over millions of years, the continents moved into the positions they are in today. Africa is at centre, surrounded by areas that will become South America (lower left), Antarctica (lower centre), Australia (lower right), India (centre right), Eurasia (upper right to upper centre), and North America (upper left). Many continents have formed and broken up during the 4.5-billion-year history of the Earth.
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