EarthViewer is an informative and fun way to learn about our "deep history." This app, geared to science teachers and students, covers 4.5 billion years of geological and atmospheric information. Cool animations let you watch the continents drift on a virtual globe. The app shows changes to the planet's temperature, oxygen and carbon dioxide levels, the length of the day, and the Sun's luminosity, from the earliest eons through modern times. Even better, the app is free.
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Submitted by Kerim Taskan - New Media Ambassador at GEYC Resources Center