CHRIS BUTLER / SCIENCE PHOTO LIBRARY CHRIS BUTLER / SCIENCE PHOTO LIBRARY
Ancient Earth. Computer artwork centred on the Yucatan Peninsula, where the asteroid that wiped out the dinosaurs is thought to have impacted. This event, some 65 million years ago, marks the boundary between the cretaceous and tertiary eras, and is known as the K/T boundary. North is at top. Land is green, water is blue and clouds are white. The continents of North America (top centre), South America (lower right) and Africa (far right) are seen. The position and shape of the continents has changed over time due to continental drift, erosion and climate change.
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