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

  • Published: 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:

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Comments • 893

  • Johnny Hawkins
    Johnny Hawkins  20 hours back

    I can dig it!

    • glidercoach
      glidercoach  1 days back

      Catastrophic floods caused by man made global warmi...
      oh. Never mind.

      • Heikki Kaila
        Heikki Kaila  5 days back

        I bet Joseph threw a kickass pardee after he cracked the mystery

        • SV IOREK
          SV IOREK  5 days back

          Back when global warming started LOL

          • King Miura
            King Miura  5 days back

            The ice dam broke by floating upward????? How about the water pressure at the base of the ice dam caused ice melting until there was an opening that quickly widened and resulted in a collapse of the dam?

            • Avinash Dal
              Avinash Dal  6 days back

              Not enough evidence

              • Michael Hodge
                Michael Hodge  1 weeks back

                I LIVE IN MISSOULA

                • Cody
                  Cody  1 weeks back

                  Weird hearing about all these places I live near/drive by all the time

                  • Jared Green
                    Jared Green  1 weeks back

                    ice age mega flood was caused by a volcanic eruption during an ice age is my guess

                    • garrisp
                      garrisp  2 weeks back

                      Hahaha a cooling event is not a cause for “woolly” mammoth extinction, the sun is.

                      • garrisp
                        garrisp  2 weeks back

                        Is this uniformtairianism a version of today’s “98% scientists consensus who agree in man made climate change?”

                        • garrisp
                          garrisp  2 weeks back

                          Must have been Paleolithic cow farts that caused the ice to melt so rapidly 🤣😭😂 🐑💨

                          • Scott B
                            Scott B  2 weeks back

                            Odd that they ignore the coulees that don't fit this narrative.....

                            • Gary Chynne
                              Gary Chynne  3 weeks back


                              • Den Morin
                                Den Morin  3 weeks back

                                Interesting, and though those of us with an attention span are very few, please slow down for goodness sake. So your video is a couple minutes longer.

                                • Orion Strongman
                                  Orion Strongman  1 months back

                                  Name: Randall Carlson
                                  YouTube Channel: GeoCosmic REX
                                  Let the Master guide you through this subject.

                                  • Chantel Wensley
                                    Chantel Wensley  1 months back

                                    I’ve never heard or seen any of these places ... could someone make a list of the sites shown - id love to visit

                                    • 1969cmp
                                      1969cmp  1 months back

                             is talking a long time for the adherents to Darwinian ideology to be set free from the uniformitarian cage.

                                      • 2l84t
                                        2l84t  1 months back

                                        Interesting , Lake Agassiz drains around the same time as the Dryas event.

                                        • LONNIE DOBBINS
                                          LONNIE DOBBINS  1 months back

                                          Easy to see layers deposited on top of each other. A flood?

                                          • sum body
                                            sum body  1 months back

                                            Surely you are not saying this happened before the industrial revolution, so this huge climate change had nothing to do with people ??

                                            • Tibovl
                                              Tibovl  1 months back

                                              Rate of change matters. The relation between CO2 concentration and global and global temperature has been known about for over a 100 years.

                                              When science doesn't make sense there's 3 options.
                                              1) the scientists are all stupid and wrong.
                                              2) the scientists are all out to deceive you.
                                              3) You don't understand something.
                                              Which one do you think is the most likely?

                                          • sclSolitarium
                                            sclSolitarium  1 months back

                                            Steve is my hero

                                            • kazemizu
                                              kazemizu  1 months back

                                              Wait, how did the glaciar dam(?) form?? If water is flowing, how would it freeze?? Also, if the temperature is cold enough to freeze glaciers, how could a lake form behind it without freezing itself??

                                              • Jeff DeWitt
                                                Jeff DeWitt  1 months back

                                                Very interesting and well done, but some inaccurate information at the end. The problem Venice is facing has nothing to do with rising sea levels (they really aren't, at least not by much), but by the fact the land under the city is actually sinking.

                                                • Tibovl
                                                  Tibovl  1 months back

                                                  Yeah, I agree it's a miswording. But the end result remains the same.

                                              • Larry Brennan
                                                Larry Brennan  2 months back

                                                Bretz said there had been catastrophic floods, and was denounced by the established authority. Wegener said the continents moved, and was denounced by the established authority. Nowadays established authority denounces those who express skepticism about the "climate crisis". And the circle remains unbroken.

                                                • Tibovl
                                                  Tibovl  1 months back

                                                  @Daniel Meeks Is an ad hominem attack honestly the best you could come up with?

                                                • Daniel Meeks
                                                  Daniel Meeks  1 months back

                                                  Will Brobeck yeah, I know you think wrestling is real too.

                                                • Will Brobeck
                                                  Will Brobeck  1 months back

                                                  That's a flawed analogy. The proper comparison would be to say "these catastrophic floods never happened" AFTER it was established science that the geography in the regions cited in this video were shaped by epic floods — which would be silly. The parallel you've made is ridiculously surface-level. But oh, please do go on about all the credentialed scientists with published, peer-reviewed research that challenge the established science that we're going through a period of global warming, with the largest contributor to this phenomena being greenhouse gas emissions caused by human activity.

                                              • Daniel Allred
                                                Daniel Allred  2 months back

                                                Great geology an history lesson. Fascinating!

                                                • jukebox symposium
                                                  jukebox symposium  2 months back

                                                  The erosion lines are where water poured off the edges as the Laurentide glacier retreated as evident today in Bhutan, between India and China as Himalayan Glaciers now also begin to retreat due to the warming globe caused by the human impact(fossil fuel) on climate change.
                                                  The Younger Dryas Multiple Meteorite impact event in Greenland 12900 years ago triggered a climate change that caused the second most recent warming trend out of an ice age during the last eon of "Humanity" prior to what we are witnessing today with global warming from human impact(fossil fuel) on climate change. What has taken thousands of years to reach a few degrees difference in temperature is now being accomplished within centuries & now even decades due to the over-combustion of fossil fuels for people driving 3 ton machines around for their lazy 170 pound asses. Although Carbon Dioxide is often targeted as being the most exhausted gas & harmful for a greenhouse gas, there are many others just as toxic being emitted with little recourse. They would compare cars to humans expelling Oxygen to appear harmless, meanwhile they are busy pushing global warming for de-population Agenda 21...

                                                  • Mobey Dick
                                                    Mobey Dick  2 months back

                                                    Imagine if a Norwegian School girl could have stopped it!

                                                  • Daniel Smith
                                                    Daniel Smith  2 months back

                                                    Enough water to fill half of Lake Michigan?? That's a LOTTA damage

                                                    • Big Red
                                                      Big Red  2 months back

                                                      It seems so excruciatingly barren around your town.

                                                      • C Scott Gaumnitz
                                                        C Scott Gaumnitz  2 months back

                                                        Your home town can smoke a pole.

                                                        • JH R.
                                                          JH R.  2 months back

                                                          Who are you and what do you know?? Nothing and nothing as I can see.
                                                          Just see what Randall W. Carlson has to say. He already knows a lot more than you do and knew it years ago when you were still against catastrophism

                                                          • jkwfo
                                                            jkwfo  2 months back

                                                            must have been a lot of HUMANS around then to cause this massive global warming

                                                            • Singularity
                                                              Singularity  2 months back

                                                              Randall Carlson enters chat.

                                                              • Kevin Harris
                                                                Kevin Harris  2 months back

                                                                So basically, its always uniformitarianism, until its catastrophism.

                                                                • Nancy Rose-Chism
                                                                  Nancy Rose-Chism  2 months back

                                                                  I can't believe that they are still trotting out that old Lake Missoula ice dam hypothesis in spite of all of the comet strike evidence. Just goes to show how slowly the wheels of official science orthodoxy grind. Still!

                                                                  • Vincent Quercia
                                                                    Vincent Quercia  2 months back

                                                                    Wow that song in the beginning is beautiful. What’s the name of it?

                                                                    • Less1leg Pirate
                                                                      Less1leg Pirate  2 months back

                                                                      The geologist was brutally set upon by academia who set out to destroy him personally and professionally. hmmmm. sounds a lot like today's liberal climate change supporters attacking any person who question Global Warming.

                                                                      • 7munkee
                                                                        7munkee  2 months back

                                                                        Do you have any evidence that there were 7000 continuous years of epic floods or is this another Russian Collusion pipe-dream? There WERE epic floods but not for 7000 years.

                                                                      • xadam2dudex
                                                                        xadam2dudex  2 months back

                                                                        These floods ( Missoula Floods ) were the result of the development of a large lake ( Glacial Lake Missoula ) of meltwater in the northwest U.S. and coming from the retreating ice sheets at the end of the last ice age ...just as the biblical global flood, which reflooded the Mediterranean Sea, so too did these floods help raise global sea level 400 ft ....

                                                                        • jp f
                                                                          jp f  2 months back

                                                                          He didn’t discover it though tbh, natives here have known about the floods.

                                                                          • Aj Blazed
                                                                            Aj Blazed  2 months back

                                                                            ""OLDEST EVIDENCE FOR HUMANS IN THE PACIFIC NORTHWEST IS ONLY 15000 YEARS" not even close to accurate information

                                                                            • Aj Blazed
                                                                              Aj Blazed  2 months back

                                                                              @jp f indeed even as far back as 150000 years back

                                                                            • jp f
                                                                              jp f  2 months back

                                                                              Aj Blazed facts! 130k+ at least.... the Bering straight theory has been disapproved from so many angles too 🤦🏽‍♂️

                                                                          • Quigon Jin
                                                                            Quigon Jin  2 months back

                                                                            Great video. Very well explained. One question though, what caused the glacier to melt 12,000 years ago. I mean, humans weren’t burning fossil fuels back then. Right??

                                                                            • Tibovl
                                                                              Tibovl  1 months back

                                                                              The milankovich cycles. Changes in tilt and orbit of the earth. It's too complex forme to explain properly in a YouTube comment. But there's a lot of information on this if you look for it.
                                                                              In short, earth warmed a tiny bit, allowing for a cascade of effects to take place. Much like could happen now.

                                                                          • Thileep kumar
                                                                            Thileep kumar  2 months back

                                                                            So ice age animated movie was to point.

                                                                            • Rosolino Lo Sciuto
                                                                              Rosolino Lo Sciuto  2 months back

                                                                              Nel periodo prediluviano i giganti Nephilim si accoppiarino con donne etero

                                                                              • maddhatter0
                                                                                maddhatter0  2 months back

                                                                                By "met with scepticism..." did you mean, shunned I to oblivion by the geological community? Because that is what historically happens when you present a new theory in sciences that have "understanding" of said science. It only took, more than a 1/4 century for other geologists to come to terms with the real truth, instead of what they "knew" happened there. In essence if you go against the grain, you will be shunned untill, 25+ years later(if even in your own lifetime) when so much evidence is there that they can't shun you for being "outrageously wrong" as the geologists of the time said of Mr. Bretz.

                                                                                • Jimmy Cranier
                                                                                  Jimmy Cranier  2 months back

                                                                                  Most of those witnesses lived in valley's in front of the oncoming disaster , most all died . Only the lucky few could pass on the stories.

                                                                                  • Chandylands
                                                                                    Chandylands  2 months back

                                                                                    Didn’t y’all recently have a video where y’all said it rained for 2 million years?