How old is the Earth?: Crash Course Geology #17

By CrashCourse

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What do iron deposits, fossils, and radioactive meteorites have in common? They’re all keeping records of our geologic history, the unimaginably long period of time that our Earth has been swinging around the sun. In this episode, we’ll look back into geologic time, discovering what we know, how we know it, and what it all means. Introduction: Michigan's Upper Peninsula 00:00 What is geologic time? 0:39 How do we study geologic time? 3:06 How old is Earth, and how do we know? 7:43 Review and Credits 10:34 Sources: https://docs.google.com/document/d/1RpwM8ZQPFk_DkzMJjMdtRrNGrJSNJ7FbgmQybSZ2Cqo/edit?tab=t.0 Check out our CC Geology Extracurricular Playlist here: https://www.youtube.com/playlist?list=PL8dPuuaLjXtOmqnkvEtNVOrm0eaIjFjJ7 *** Support us for $5/month on Patreon to keep Crash Course free for everyone forever! https://www.patreon.com/crashcourse Or support us directly: https://complexly.com/support Join our Crash Course email list to get the latest news and highlights: http

Tags: vlogbrothers, Crash Course, crashcourse, education, complexly, crash course, john green, hank green, crash course geology, study, review, crash course new, sage the bad naturalist, geology, intro to geology