All of the featured books, and many others, are available electronically. If you need help accessing and using ebooks provided through RBD Library, the usage guide linked above provides instructions. Live help is available via chat during business hours. Most ebooks can be downloaded and read on devices like your personal computer, tablet, or e-reader. A few ebooks require you to be logged in through a browser and may limit the number of simultaneous readers.
The best way to start a general search is with Discovery, AU Libraries' one-stop shop for scholarly resources. Discovery is something like Google for the library and will return a wide variety of sources for you to use, including books and ebooks, journal articles, news and magazine articles, and more.
Need help with Discovery? There's a guide for that:
This video, "A Brief History of Geologic Time", summarizes Earth's development into the world we know today in under fifteen minutes. Credit: PBS Eons.