What did the Earth look like 250 million years ago? How about 4.5 billion years ago? All shall be revealed with the Earthviewer application, which was created specifically for the iPad. The application is completely free, and it allows users to see continents grow and shift over billions of years. Additional layers allow users to explore changes in atmospheric composition, temperature, biodiversity, day length, and solar luminosity. Visitors should look through the Supporting Materials area when visiting the site. Here they will find a helpful video tour of EarthViewer's features, a number of classroom ideas, and materials from the BioInteractive.org site. These particular materials include the short film "The Day the Mesozoic Died," which addresses the discovery of the dinosaur extinction during this geological era.


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