EarthViewer is a free iPad app that takes you through 4.5 billion years on Earth. EarthViewer allows you to select eons and eras to view. Within each eon and era you can view tectonic plates, continental drift, and other geological events. You can view major biological events in EarthViewer too. Climate data for the last one hundred years is available in the app. EarthViewer users can manipulate the virtual globe to see how each continent has moved and been altered over time.
EarthViewer could be an excellent resource to include in a science or geography lesson. The EarthViewer developers recommend using the app to have students investigate the relationship between temperature and carbon dioxide concentration. They also recommend investigating the correlation between oxygen concentration and animal diversity.