Geology 101 with Willsey, Episode #2: Intro to Plate Tectonics
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- Опубліковано 16 лип 2024
- New to geology, want to learn some basic concepts, or just need a geology refresher? Join geology professor Shawn Willsey for this new series as he presents the same lectures as his GEOL 101 (Physical Geology) course. These videos are for everyone.
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00:00 intro
01:59 Wegener and Continental Drift
14:40 Initial reception to continental drift
16:23 seafloor spreading and paleomagnetism
24:52 Plate Tectonics established - Наука та технологія
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You're a naturally born teacher. Thank you
Wow, thank you!
This is so fascinating! You know your teacher is outstanding when the presentation flies by and you don’t want it to end. 👏🏼
In 1966 I was a freshman taking Geo 101. Scientific American magazine (before it became a political science publication) had an article about continental drift. Being a foolish freshman I asked the professor , who was the head of the department, if this made sense. As I recall nearly 60 years ago, one argument had to do with coast line levels. His reply was something about cyclothems, some sort of periodic fluctuation in seal levels due to unknown reasons. After two years in geology, with a dexterity failure in preparing thin sections on slides t identify minerals., I switched to math as a major. After teaching in high school I managed to get into Duke as a grad student in computer science, met my wife of 44 years, and pretty much lived happily ever after. But I'm still a geology dilettante, and watch you and Nick Zentner as often as possible.
Thank you - it helps solve my "I wish I had taken Geology in college" need
Thankyou professor Shawn. I'am 59 years old and I really enjoy listening and watching your Islandic, Hawaian and geological videos. Your English is easy to understand even though I'm Mexican. Enjoy your trip with your family.
Excelente!
I first learned about Wegener and continental drift in high school in Germany, which got me quite interested in geology in general. That was some 45 years ago, and life and other interests took over. Then I started following you for the Iceland updates. Have watched all of your videos since, plus many from other channels, and I love geology more than ever. Thank you!
Awesome. Glad to hear this.
thanks professor, you really explain this complex stuff in understandable words.
Wow! Fantastic explanation, thanks Shawn for sharing your knowledge with us 👍
Appreciate these so much Shawn, thank you.
PERFECT timing. Have seen all your mineral lessons, roadside geology, “field trips”, and volcano reporting. (All Absolutely wonderful.). Visited Ohio friend and in her backyard were fossils and clamshells in the rocks! No ocean for hundreds of miles, so got me wondering…now i am waiting for geology 101 lesson #3.
Truly loving this new series, much appreciated!!
Thank you so much, Professor, you're absolutely fascinating to listen to.
Looking forward to your future episodes, especially on continental Africa, I've been curious ever since reading Thomas Sowell's observations on the geological, geographical, and climatological influences on cultural development. What struck me was that Africa is, for the most part, a high plateau with the East coast being very steep, and so on. Thank you, most informative and engaging.
Thanks for giving us the opportunity to get the basics. Really fascinating and so clearly taught!
Thank you Shawn. I just Googled "best teaching styles" and your name was at the top of the list. Just kidding, but you are among the top 1-2 educators I have seen in action over my long career.
Best refresher I've ever had ! Not only the 101 but also the live streams and your other videos.Thanks you so much again. If someone had promised me a geology prof like you, I would have dared to study it! Ended up in humanities ...well, was o.k. 🙂
Can't wait for the next episode. We will find out if I remember the basic tectonic boundaries, convergent, divergent and strike slip.
Thanks! Finally getting around to pony-ing up. All the Iceland material, interviews, random road cuts, and now this 101 series.
Thank you! Such a clear presentation of tectonics. Interesting to see what the continental lineup looks like next. Baja BC, The Sequel!
Thank you, Shawn. The time just flew by, it was fascinating to get some of the history around the development of the theory of plate tectonics.
About 1960 I commented to my Geography teacher about the similarity of Western Africa to South America in my GCE O level course. He dismissed it as pure coincidence. He probably studied for his degree about 1930
Yes I did the same around the same time...and got the same answer!!😆
Hi Shawn Willsey, great job as always, particularly like that it is so natural flowing from you with ease. I grew up near the Hudson River and first climbed on the crude , crumbling basalt columns of the Palisades and remember from a kid learning it was identical to a wall on the northern coast of Africa.
There's actually a documnetary series about what Australia will look like in that future. It's called Mad Max. ;)
Ha!
I looked up the plates that Indonesia is on. Wow! No wonder its geology is so turbulent. I have a brother buried there and have visited, thus my interest. Thanks, Shawn.
Thank you Shawn.
I really love these lectures. They reinforce what I learned many years ago.
Thanks for illuminating the distinction between continental drift and plate tectonics. In my mind, they've always been synonymous, which is why I thought PT was obvious long before that mechanism was discovered.
Eager to see what new knowledge Lesson 3 will impart.
Fascinating stuff!
I started this video soon after you uploaded it, but life got unexpectedly busy and I’ve had to wait until Saturday night to finish it. Argh! You really have a gift for laying out a good survey course amount of learning, especially given you’re not getting any personal feedback from seeing our faces in the same room or know the backgrounds of all of your viewers. I’ve been rewatching or watching your rock and mineral ID videos, older videos and all the current ones. I purchased the Simon & Schuster rock & mineral book you recommended, too. I’m a college prof too, in music, so from one to another, I tip my hat to you: respect and appreciation from Minnesota!
This leads to a lot more questions for me - looking forward to future videos!
Thanks Shawn for this class on plate tectonic. How fascinating. You explained it so well. I was so fascinated by what you were saying that the time flew by. I really enjoyed it. You are a very good teacher. Again thank you.
Very enjoyable, many thanks for taking your time to help others
Thank you so much, Prof Willsey. I am super excited about your initiative to deliver lectures about important geology topics, in addition to the fieldwork videos you have been doing. I cannot thank you enough. Cheers. The lectures about the basics of geology are really helpful for people like myself. Thank you.
Thanks again for the lesson. 2:2.
Although I didn't make it my career, Geology has always been my favorite subject and I was blessed to live in the Eastern Sierra for 16 years
I look forward to more episodes. At college...a long time ago...I focused my science requirements on earth the sciences. I took intro to geology, physical geography, geomorphology, cartography, and urban geography. The latter one also involved history and social science. I had several field trips in the Arizona desert. My favorite was to an alluvial fan.
Great 101 class!!
This is soooo exciting
Love today's lecture 👌 very interesting. Thank you
That was awesome. Thank you.
I'm so happy you're making these video's. Thank you so much 🙏
I once saw an animation of the western US being pulled apart and Nevada gets split into two with a new seaway up
and down in the center. Las Vegas will be a seaport on the Pacific Ocean about 15 to 20 million years from now! It
also showed a new coastal mountain range going up and down the western edge along the part that the LA to Portland
drifted area will be looking at to its east by then. Fascinating continetal drift stuff professor.
I was a geology major at USC in the late 60’s; plate tectonics was just entering the text books and lectures.
Thank you again! Catching up. Busy summer
I know one thing that's evidence of plate tectonics is that the mountains we have in the north of Scotland have been discovered to be the same range as the Appalachians!
Great lesson!!! Thank you!!!
Yet another exciting episode of your Geology 101 series! Again, you have a captivating way of explaining complicated things. I can't thank you enough for doing this, Shawn :) When I was young, plate tectonics was somewhat "new", barely known to the general public and not taught at all in French schools before the 80s anyway. When I later found out about it, I was fascinated... Also, very interested in what you said about the magnetic signature of rocks, hope to dig further into this... And now on to Tectonics part 2! ;)
This was fantastic! Super fascinating. Thank you so much for teaching in such an easy to understand way. The illustrations are super helpful.
Thanks, Shawn. Inspiring, as always.
Excellent video. Have been following all your updates on Iceland and this (after episode #1) really starts to put everything into context.
I found the part about Wegener' s theory very interesting. Along with rest
Thx for the great presentation, Shawn! 😎
Another excellent class! I have recommended your videos to so many people.
Thanks for your support.
I love your geologylessons! I Think I'm learning! 😅 At least I'm paying attention now - as a teen in school, not so much.. 🫣
Thank You Professor! Looking forward to 101 #2 part 2 !
Wishing you + fam. a nice weekend!
Greetings from Värmland Sweden
Thank you so much Shawn for all your lessons!🙏🏼My story is exactly like the story of @mungbean60. My life and understanding of our planet became so much richer because of you! Besides you’re a great teacher you are a very likable person. Love from the Netherlands 🧡🙏🏼🧡
Thank You!!🤗 You are such a fantastic teacher and make everything soo easy to understand and soo interesting!!👍 If I would have had You as my teacher in school I would definatley have become a geologist!! Glad to get to learn all this now !! Better late than never!! 🤗👍
You are so welcome! Thanks for your kind comments.
Ahh first year lectures again! Love it! I’d forgotten the details. What’s new to me is the future predictions of the plates. Thanks again. (Sent a PayPal donation the other week - really appreciate all your work and time).
Thanks for watching and your kind donation.
I once heard that California will one day go north to Alaska. Good program, thank you.
Thanks!
Fascinating! Thanks.
Thank you, I can't believe all the stuff I've forgotten over the years!
Excellent. Very interesting.
Excellent review of 100 yearsof historic geology
Thanks! Another great video, Shawn. Enjoying your channel very much!
Thank you kindly for your donation. Glad to hear you enjoy these.
I watched this earlier on my TV cuz the monitor is bigger than my crappy little lap top. Love this series . 8-)
Thanks Prof Shawn for the lesson. I wondered what extra info could be found via the UA-cam links to your slides on continental movements and Earth's magnetic field - the 1st worked fine but the 2nd linked video no longer exists. You're welcome ;)
At start of your lecture, you mention "in person lab". Do you drill holes down and create mini volcano in your lab so students get to scoop up some lava to dip it in a water-filled bucket and then analyze it? 🙂 Do you let lava flow in corridors so students can see the difference between A-Ah and Pahoehoe 🙂
BTW, did you ever watch the series "From the Earth to the Moon" ? One episode at end of series is dedicated to geologists teaching astronauts on what to look for on the moon.
Great stuff👍👍👍👍👍👍👍
Di…Cumbria
Just finished watching the Iceland Geology video and that was very interesting. Also congratulations on 109K.
Thank you 🙏
¡Gracias! A small donation, but with admiration.
Garcias por tu amabilidad
absolutly love your teaching thanks from Denmark :)
A fascinating topic, thanks again!
Glad you enjoyed it!
Thanks, I enjoyed that a lot. Lately there's been talk of New Zealand being part of a "new" continent or plate. I look forward to any input you share about that.
They should give Shawn Willsey crash course Geology series
There has been a series of earthquakes today going on along the Pacific and Antarctic ridge. It started with a 6.2 at 09:55:49 UTC.
I'd be very interested in seeing some of the lab components of your class. As a former lab technician, I'm actually more than interested.
as a boy growing up in the 1950's I always thought the continents were at one time one piece and through time, they grew apart. I would say this to teachers and others resulting to me being ignored as a dreamer
Ty this was grest.
Thanks for the video Shawn.
I would have thought that you would have put the seafloor spreading earlier in the video for more of a chronological order of relevant discoveries where the bands of magnetic reversal in the sea floors that was discovered during WW II by the navies searching for submarines.
Shawn, thanks so much for posting this content. I always wished that I taken a course in geology while in college, and now that I'm retired, I have time to enjoy your videos. What text do you use with your course?
6:10 Surprised to see your animation has North America drifting northward over the next 50 million years. I thought that the general motion of (most of) North America currently is slightly south of due west, with NA having peaked in northerly latitude several millions of years ago.
From a cartoon by, I think was, Anderson and that I think appeared in "Summit." Picture an Arctic waste, flat with distant hills on the horizon. Empty dog sled with the harnesses lying empty on the ice. An expedition member reporting to the leader on the situation: "Sir, we've eaten the last of the geologists."
Maybe beyond an= 101 course, but would be interested for your take on the work of Karin Sigloch tracking what happens to subducting plates as the go down.
That is a 400 level course! I assume you follow Nick Zentner?
That animation for the future 50 million years or so did not include the formation of a new, fairly large island near East Africa. As far as I know, East Africa is rifting and eventually will move to the east, carrying Somalia, Ethiopia, Kenya, Tanzania and parts of a few other countries with it.
There are many quakes in Italy the swarm is scary 100s of light shakes
Weird to think Aus ending north! I’d love to see how different we would look.
My late friend wad given a 'Brunton Compass' by his parents!
Hey Shawn! Awesome presentation! Thank you for sharing all of your knowledge with us! I did have a question of sorts. When you presented plate movements in the future, I noticed it didn't account for things like the formation of the East African Rift and the splitting of Africa. Was the video you showed representing plate movements as they are as of today and they do not change directions from their current movements? Thank you!
Theoretically, how high could the Himalayas get before their height simply crushes and laterally fluidizes the lower rocks? Right now I calculate about 35,000 psi (didn't show my work) under Mount Everest.
I passionately recommend you watch. “Voyages of the Continents”. It’s very interesting and very scientific.
Shown on Amazon Prime Video
Shawn, I always wonder if when the poles "flip" does it happen suddenly?
@shawnwillsey Naive question about your comments about the climate changes when australia moves north or baja california goes north- I was under the impression that the placement of the continents also affects the oceanic and atmospheric currents. So as the plates keep moving the weather patterns worldwide might significantly change. Perhaps you might cover this aspect as you describe the plates in more detail.
In my experience, climatology and oceanography is not really discussed in an intro geology class. Could be that Shawn will make a mention of climate changes when he covers deep time in an example later, but this video may be all that is covered about climate in this class. Yet, AFAIK, there is no easy way to determine an expected climate by looking at land distribution on the planet.
@@TheDanEdwards Let's see what Shawn says. Geogirl had some videos covering how the ocean currents were affected. For example if there is no Atlantic ocean there is no gulf stream carrying warm waters to Europe...
So glaciers emanating from Southern polar regions ok. So that was a land mass . But arctic gives no glaciers - Is that right ?? It is all deep ocean even today ? (territorial claims abound). So interesting and many thanks for the stimulating lesson .
what is best academic oriented Tectonics textbook?
It’s shown on Amazon Prime video.
Sorry if this is a dumb question. What would be the impact on navigation technology if the magnetism is reversed? Do East and West stay the same?
Can we tell whether there’s convection within the mantle as a whole? Do we know for a fact that today it’s more like a layer of firm tofu-squishable but ultimately solid-than it is one of some extremely viscous fluid like pitch?
Thank you for these videos. Geology is one of the classes that I didn’t manage to take during college.
What a great refresher!
Question: how do you measure the magnetic signature of rocks? I assume they need to stay in place during measuring. Or is it enough to precisely record the orientation of the rocks when still in situ?
It is a complicated process. First, they use a gasoline powered diamond tipped coring tool that is water cooled to drill down about 2 inches, then they use a Brunton or other compass to mark magnetic north on the sample and take it back to the lab to
test the strike and dip of the magnetism stored in the rock. There are video on UA-cam about the process.
@@johncooper4637 Thank you! So the strike and dip are measured in a lab. That does need careful documentation, but doable of course. I'll find some docu's about it and learn more.