zakruti.com » Knowledge, science, education » Crash Course

How old is the Earth: Crash Course Geology #17

video description

Rating: 4.0; Vote: 1

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: Check out our CC Geology Extracurricular Playlist here: Support us for $5/month on Patreon to keep Crash Course free for everyone forever! Or support us directly: Join our Crash Course email list to get the latest news and highlights: Get our special Crash Course Educators newsletter: 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 - Facebook - Bluesky - CC Kids:
Date: 2026-09-04

← Let's Go on a Field Trip!

Related videos

Crimea Situation Is Insane

• RealLifeLore

The Internet is Driving us Crazy

• Whatifalthist

Ms. Rachel Answers The Web's Most Searched Questions

• WIRED

TEST: Espressioni Idiomatiche Italiane con i COLORI (Quante ne sai)

• LearnAmo

Non usare BUONA FORTUNA in italiano, per favore!

• LearnAmo

What are tariffs, and how do they work

• TED-Ed

Comments and reviews: 4

Beryllahawk
One thing I wonder about is what do we do about rocks that don't have isotopes. I know, she said relative dating is at least part of the current solution. But are there other techniques too, or is it guesswork Nothing wrong with guesswork mind you: but it does mean we can still search for different methods of dating a given rock, right
Also curious which rocks DON'T work well for absolute dating, and which isotopes are the most troublesome.
reply

RlfMeetsAValkyrie
Mabye I zoned out, but no mention of the Genesis rock that was collected on the Moon! I would be offended, but I get that there is just too much to cover on the age of the Earth. Thanks for the video!
reply

luck0717
For a second I thought this was two strategies to dating (other humans. I was simultaneously disappointed and delighted it was actually about rocks
I was ready to learn the strategy of ABSOLUTE DATING
reply

thomasgoodwin2648
I thought oxygen could only be created in the intense fires of stellar fusion, not pooped by bacteria.
I still have so much to learn.

reply

Add a review, comment