Tonight we revisit a relaxing science classic, The Principles of Geology, erode away stress with a stroll through the stony halls of geological history, and ponder some very odd theories about our planet.   Read "The Principles of Geology" at Project Gutenberg: http://www.gutenberg.org/ebooks/33224   Follow and chat with us on Twitter: https://twitter.com/boringbookspod   Support us on Patreon and get exclusive perks: https://www.patreon.com/boringbookspod   Music: "earth 2 earth," by PCIII (freemusicarchive.org), is licensed under CC   All Boring Books for Bedtime readings are taken from works in the public domain. If you'd like to suggest a copyright-free reading for soft-spoken relaxation to help you overcome insomnia, anxiety and other sleep issues, send a recommendation on Twitter, on our website, or on Patreon. I'd love to hear from you!