How 7,000 Years of Epic Floods Changed the World (w/ SciShow!)

  • Published on: 28 February 2019
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    Check out SciShow's video on Lake Agassiz:

    Strange geologic landmarks in the Pacific Northwest are the lingering remains of a mystery that took nearly half a century to solve. These features turned out to be a result one of the most powerful and bizarre episodes in geologic history: this region experienced dozens of major, devastating floods over the course of more than 7,000 years.

    Thanks to Franz Anthony and Studio 252mya for the flood and lake illustrations. You can find more of Franz's work here:

    Produced in collaboration with PBS Digital Studios:

    Super special thanks to the following Patreon patrons for helping make Eons possible:

    Katie Fichtner, Anthony Callaghan, Larry Wilson, Merri Snaidman, Renzo Caimi Ordenes, John Vanek, Neil H. Gray, Marilyn Wolmart, Esmeralda Rupp-Spangle, Gregory Donovan, Ehit Dinesh Agarwal, سلطان الخليفي, Gabriel Cortez, Marcus Lejon, Robert Arévalo, Robert Hill, Kelby Reid, Todd Dittman, Betsy Radley, PS, Colin Sylvester, Philip Slingerland, Jose Garcia, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Daisuke Goto, Hubert Rady, Yuntao Zhou, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Ron Harvey Jr, Jacob Gerke, Alex Yan

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  • Runtime : 10:26
  • dinosaurs dinos paleo paleontology scishow eons pbs pbs digital studios hank green john green complexly fossils natural history ice age floods geology pacific northwest missoula floods catastrophism uniformitarianism bretz dry falls channeled scablands glaciers pleistocene cuvier missoula flood lines montana idaho washington scablands


  • AnEnemy100
    AnEnemy100   1 weeks ago

    Slow down if you want us to listen.

  • Mitch Hakker
    Mitch Hakker   1 weeks ago

    How does an ice dam break more than once? How does it reform and the water behind it not freeze? It seems weird that a structure that can contain that much water be built up by freezing water in 20-60 years...

  • Eric Taylor
    Eric Taylor   1 weeks ago

    What would it have been like to witness one of these floods? It would have been wet.

  • Heinrich Nienaber
    Heinrich Nienaber   2 weeks ago

    So the great flood really did happen! Ha!Check mate Atheists

  • Jay Kidd
    Jay Kidd   2 weeks ago

    keep the Brown Eye open.... you aint seen nothing yet... keep looking up....

  • PrivateSi
    PrivateSi   2 weeks ago

    I'm a Many Impact (+ airburst) Theory semi-believer. I am not going by the Younger Dryas Boundary Layer of charcoal, nano-diamonds, iridium, ++, more Tunguska and the number of small impacts recorded over the last 100+ years of decent record keeping.

  • BillHimmel
    BillHimmel   2 weeks ago

    How can water "lift" a bolder?? Bolders don´t float, no matter how much water you use!

  • Justin Z
    Justin Z   2 weeks ago

    Incredible! I lived in washington as a kid and got to see dry falls. It's truly a beautiful and intriguing site.

  • Dukegun
    Dukegun   3 weeks ago

    I think Pardee was correct, but the flood was caused by an asteroid impact.

  • Time Traveler
    Time Traveler   4 weeks ago

    I will have to go to Idaho with bringing my time-traveling device, and go traveling back to prehistoric time and explore Lake Agassiz. Thank you for this fascinating geological information. So, I will crank up for my time travel adventure now.

  • Queen Dean
    Queen Dean   1 months ago

    i don't know if you guys have published a video on the pleistocene paleolake Lake Bonneville in utah, but that would be a really cool video idea if you haven't.

  • Richard Timbreza
    Richard Timbreza   1 months ago

    From 1.000 bc to 1.000.000 bc....It Was A Big Giant Island in the Middle Pacific Ocean It Has Less Water Before And Its Called The Lost Continent Island Of MU........

  • translucentorb
    translucentorb   1 months ago

    In Saratoga county of upstate ny there are 3 or 4 abandoned overflow channels that the precursor of the Mohawk River ran through, 8-10k years ago. Since there was still an ice sheet blocking the St Lawrence River valley all of the drainage from the early great lakes was shunted through this area and into Lake Albany.

  • Thomas Mackie
    Thomas Mackie   1 months ago

    Do you think this type of process could be why people built in the cliffs in Arizona and New Mexico?

  • cf-apps7865
    cf-apps7865   2 months ago

    No, you have not got it figured out. A fragmented comet hit the ice cap, no ice dam could hold back that much water. It's absurd.

  • Ace Everwoode
    Ace Everwoode   2 months ago

    Is this the flood in the second Ice Age movie?

  • Monte wright
    Monte wright   2 months ago

    Wow. Must take some great effort to ignore the speed at which the ice cap melted forming the Mississippi scour plain as well as western features that smaller sudden floods do not explain.

  • Vita Quasus
    Vita Quasus   2 months ago

    This seems to be an time where science did not follow the evidence, they waited until they no longer could deny the evidence.

  • Spirit Flower
    Spirit Flower   2 months ago

    For as long as humans and our ancestors have been on the earth it just seems absolutely ridiculous to me to think that quote in a quote there is only scientific evidence for humans being in North America for 15,000 years... and, having grown up around native people and having to hald native children myself, I know that native people know that there have been humans here far longer than 15,000 years! I'm curious about what you guys really think about that! Thank you much for these videos! I find your channel very interesting!

  • Clay Maxon
    Clay Maxon   2 months ago

    This is out of date. No way Lake Missoula made the scablands.

  • MaiCohWolf
    MaiCohWolf   2 months ago

    I'm not native, but I used to live on the Flathead reservation in Montana. Several native groups in that area have oral histories that mention massive floods.

  • Simo
    Simo   2 months ago

    Yes they are real too bad that modern argeology doesnt believe in any flood happen in human history

  • Kyle Alexander
    Kyle Alexander   2 months ago

    I live less than a mile from the edge of columbia and this seems a normal idea today

  • καμιά ψυχή
    καμιά ψυχή   2 months ago

    Just read me the news everyday. It'll make me feel better about it.

  • Caleb.B
    Caleb.B   2 months ago

    Ahh. I literally live in this area. And dry falls is quite impressive

  • Eric Taylor
    Eric Taylor   3 months ago

    What is that rumbling noise?Din't know. Sounds like rushing water.Dude, the ground is starting to shake!(Looks to the east) Uh oh. Not exactly something you'd want to see. Even if you were on the rim of the Gorge, you'd likely live down close to the river, and there would be no way to get out of the way in time. 60 years is nearly long enough for the event to pass from living memory, though the oldest in your village might remember before it happened again. Assuming you survived, you'd likely have lost most of the people you had known.

  • Bob Thompson
    Bob Thompson   3 months ago

    Guy says "it changed the climate". other guy 30 seconds later..."it didn't change the climate"

  • Adam Plumb
    Adam Plumb   3 months ago

    I'm all about the impact hypothesis 🤓🖖

  • Anne Chester#1
    Anne Chester#1   3 months ago

    How about hundreds of asteroids hit earth ? Under this type of pressure..water is formed from rocks..before you laugh check it out..Mountains were formed by the impact overlap..not land just decides to take a dive under a tectonic plate..Look at the amount of waters that form in a more or less circle. Bays ? Yes including all the ocians and follows laver trails because they are sealed at the bottom with set molten laver..These asteroids were nuclear..That's where uranium comes from

  • AngelOfLight1415
    AngelOfLight1415   3 months ago

    OMG I live in Montana and live about an hour away from Missoula! I never knew that's why the mountains looked like that, and I've lived in Montana for now about 21 years, my entire life! Also some how my state being mentioned in a video makes me happy, maybe because it's rural state