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How old is the Earth?: Crash Course Geology #17 12 分钟 
The Gameshow That Killed 73 People | Fascinating Horror 11 分钟 
Defunctland: The History of Disneyland's Adventure Thru Inner Space 36 分钟 
The Handwich: Disney's Failed Sandwich of the Future 24 分钟 
Scientists still identifying 9/11 victims' remains | 60 Minutes Archive 25 分钟 
Overboard From A Cruise Ship | Fascinating Horror 12 分钟 
U.S. Air Force officer shot down in Iran says it's a "modern-day miracle" he survived | 60 Minutes 14 分钟 
Barack Obama on the operation to find, kill Osama bin Laden | 60 Minutes Archive 38 分钟 
Crash Course Astronomy Marathon • Full Series 502 分钟 
DefunctTV: The History of The Puzzle Place 25 分钟 
Going under ground zero, where a dangerous cleanup was underway | 60 Minutes Archive 14 分钟 
How the Channel Tunnel Works 24 分钟 
What’s Ruining Our Ruins? 12 分钟 
How Scientists Build Consensus: Crash Course Scientific Thinking #5 11 分钟 
What Is a Good Gut Microbiome, Anyway? 12 分钟 
How Long Does Sperm REALLY Live? #science #scishow #STEM #hankgreen 1 分钟 
How Do We Chart Missing Rivers? Ask Fish! #science #scishow #geography #newzealand 1 分钟 
Scientists Can't Agree On The First Ancient City 26 分钟 
An Engineer's Perspective on the Texas Floods 24 分钟 
The twin experiment that broke genetics research 17 分钟 
Do you see the problem?! 1 分钟 
PAW Patrol's Jungle Pups Rescue Animals! 🐯 w/ Marshall & Tracker | 2 Hours | Nick Jr. 121 分钟 
Chase's soccer skills can save the day! ⚽️ 1 分钟 
Skye is missing from the PAW Patrol! 1 分钟 
Sneaking Into the Palace | Mr Bean Animated 25 分钟 
Why Can't Kids Read These Days? 23 分钟 
Pingu Loses 🐧 | Pingu - Official Channel | Cartoons For Kids 64 分钟 
Evaluating Sources & Fact Checking: Crash Course Scientific Thinking #6 11 分钟 
Rubble records a dance video with Ryder! 1 分钟 
Learn Colors with Vending Machine | Learn Fruits & Veggies | Nursery Rhymes | BabyBus 36 分钟 
Minions & Monsters (2026) 4K - Jesse Eisenberg Is Dort! (5/11) | Movieclips 3 分钟 
Why Are There No Short Arch Dams? 17 分钟 
Why the Ikea Business Model Wins 19 分钟 
What The Sun REALLY Looks Like 1 分钟 
Christians can fight back against Christian nationalism 2 分钟 
The Future Mark Zuckerberg Is Trying To Build 48 分钟 
This 1950's ATV Concept ? 15 分钟 
Why Does Japan Have 9,000,000 Abandoned Homes? 38 分钟 
Buying a 1 euro House in Italy - is it a scam? 42 分钟 
Exploring Scotland's Forgotten Castles with Giants 32 分钟 
The New Hunt for the Colossal Squid 19 分钟 
The Real Story of these Ancient Scrolls 2 分钟 
The Napoleonic Wars - OverSimplified (Part 1) 30 分钟 
Gen Z is done with both political parties | America, Actually 35 分钟 
Name That Infrastructure (Ep. 7) #shorts 1 分钟 
Why Fast Food Got So Expensive 20 分钟 
To STOP the Secret Garage Flooding…. 2 分钟 
Magnet Bikes Magnets are so Powerfull 1 分钟 
How did these lights work?? 2 分钟 
This Village Pays You $70,000 To Move There (is it a scam?) 28 分钟 
This Underwater Machine Sees Ghost Particles 1 分钟 How old is the Earth?: Crash Course Geology #17
2026 12 分钟
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: https://mailchi.mp/crashcourse/email Get our special Crash Course Educators newsletter: http://eepurl.com/iBgMhY Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever: b.sav, Martin G. Diller, Scezumin, Johnathan Williams, Mike Cumings, Jr., Allison Wood, NassauLinda, Chuck Smith, Katrix , Jason Terpstra, Jennifer Wiggins-Lyndall, Dalton Williams, DexcilaDou, Chelsea S, Matthew Fredericksen, AThirstyPhilosopher ., Scezumin, AThirstyPhilosopher ., Emily Beazley, Andrew Woods, DexcilaDou, Roger Harms, UwU, Johnathan Williams, Kyle & Katherine Callahan, Stephen Akuffo, Jennifer Wiggins-Lyndall, Shruti S, Barbara Pettersen, Gina Mancuso, Dalton Williams, Toni Miles, Mike Cumings, Jr., Quinn Harden, Michael Maher, Jason Terpstra, Matthew Fredericksen, Rie Ohta, Chuck Smith, Allison Wood, David Fanska, Katrix , Chelsea S, b.sav, Brandon Thomas, Steve Segreto, Elizabeth LaBelle, Reed Spilmann, Leah H., NassauLinda, Kevin Knupp, Martin G. Diller, Ken Davidian, oranjeez, Laurel Stevens, Jason Buster, Alan Bridgeman, Samantha, Jason Rostoker, Breanna Bosso, Caleb Weeks, Joseph Ruf, Ken Penttinen, Luke Sluder, Wai Jack Sin, Siobhán, Krystle Young, Matt Curls, Stephen McCandless, Eric Koslow, John Lee, Tandy Ratliff, Perry Joyce, Sarah & Nathan Catchings, Rizwan Kassim, Katie Dean, Ian Dundore, team dorsey, Erminio Di Lodovico, Barrett, Trevin Beattie, Bernardo Garza, Kristina D Knight, Nathan Taylor, Emily T, Constance Urist, Jennifer Killen, Thomas, Alex Hackman, Triad Terrace, Indija-ka, Evol Hong, Scott Harrison, Pietro Gagliardi, Les Aker, Tanner Hedrick __ Want to find Crash Course elsewhere on the internet? Instagram - https://www.instagram.com/thecrashcourse/ Facebook - http://www.facebook.com/YouTubeCrashCourse Bluesky - https://bsky.app/profile/thecrashcourse.bsky.social CC Kids: http://www.youtube.com/crashcoursekids
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