Geology 20 (Glaciers and Ice Sheets)

Glad to have you studying with me! I have more content in the works and I hope you'll enjoy it. For those that are interested, the best textbook out there is this one: amzn.to/47VNed8. However, it's a little old now (two of the authors have passed away) and if you prefer a newer textbook, I would recommend this one: amzn.to/45UFDcR
For other introductory geology lectures: • Introduction to Geology

[@squirrelfrendotcom]

Wow! I'm so impressed with your lectures, and since I am a rock and mineral enthusiast at heart, I'm taking the whole course. I recently was in a terrible car accident where I fractured my skull more times than they could count. All the damage was in my face, so I am recovering at home from reconstructive plastic surgery. Your lectures are part of my healing process and I wanted to personally thank you for the help you have provided me. 😇 I would love to know more about the ancient Caledonian mountains, since I live in the foothills of these fascinating structures. Thank you😊

[@tougeskyite]

Great lecture. I am very interested in both mountains and glaciers and your lecture answered many of the questions I had about how glaciers interact with the surrounding environment. Thanks.

[@Peepee4brain]

Helping a ton with my geoscience final. Great lecture super easy to pay attention to

[@alicesacco9329]

I live in a U Valley, and there are plenty of those features around me, and many many hanging valley. Now I realize how tall was my area during the Aadean.

[@vaclav.zahradka]

Extremely educative, interesting and entertaining!! Thumps up :-)

[@MrKmanthie]

Quite interesting. Easy to follow but not dumbed down nor is it condescending. And, he actually spelled "PANGAEA" correctly!! That alone gives me encouragement in his work and presentations! This is the 3rd one I've seen & I'm going to keep watching other segments in this series. Thanks!

[@johnfox9169]

I found a gold mine here. Great work!!

[@EarthandSpaceSciencesX]

Hey, thanks!

[@c.f.7408]

Very helpful as I pursue my Geoscience degree!

[@jonathanturek5846]

I just saw geo 21 - desserts then this came up in my feed. Geo -20 👍 great it looks as if there is a lecture series .. Awesome ! I will start from beginning and will enjoy adding this base knowledge to my research on exo planets.

[@brianwheeler1339]

Way better than my lecturer... and I can speed the video up :). Thank you

[@eddie_wolf_]

Amazing mouse skills! Not a student or a geologist, just inquisitive. Love your channel.

[@EarthandSpaceSciencesX]

Thank you!

[@krisinsaigon]

another interesting lecture, thanks. my hometown is in a region of northern britain shaped and scarred by the ice ages. the precession of the earth- that is what the hippies are singing about when they say it's the dawning of the age of aquarius

[@timbassett6616]

Excellent content.ioi love this content. 5 star.

[@alicesacco9329]

It is possible that under a glacier there is still a flowing river? because not so far from my home there is a moraine that, quite suddenly turns into a canyon. And my area was fully covewred by glaciers during the last glacial maximum.

[@cherie55cherie]

Your lectures are soo incredibly helpful!! Thank you so so much for sharing them! I will pass my geology class because of you :D

[@H.pylori]

Superb explanation.

[@margretkarimi828]

Great lecture. Very helpful. Thank you very much

[@raulrios1527]

Excellent videos, keep making more! also if you could launch some advanced courses it would be awsome

[@EarthandSpaceSciencesX]

Thank you for your appreciation! I'm considering several advanced courses, but am currently refining this video series for use by online students. However, I will probably do a series on Sedimentary Rocks in the near future that will be supplemental for a textbook that I am currently working on...

[@naakatube]

ANOTHER GREAT LESSON …. THANKS ❤️❤️❤️❄️❄️❄️🙏🙏🙏

[@alicesacco9329]

How do you call ages when there are no ice ages (like the Jurassic)? In italian it's called 'interglacial age', that is different than the so called 'interglacial period', but I never understand how you define the lack of ice ages.

[@mtbmax21]

Great video, thanks made it really interesting

[@valoriel4464]

Excellent presentation. Thank you

[@EarthandSpaceSciencesX]

You are welcome!

[@EMarcisz32]

from the graph 50:22 it looks like the glaciation/ice ages comes very quick, while the melting/warming is gradual... the drop in the temperatures is very significant every time, none of the causes of ice age you mentioned could explain that. Well, maybe the "changes in Earth's atmosphere" caused by mega volcano eruption, but there weren't so many of them in last 1,000,000 years. What then would be the reason for the sudden cold so often?

[@EarthandSpaceSciencesX]

The graph you are referencing is the consequence of many complicated natural environmental feedbacks, including changes in albedo, milankovitch cycles, solar radiance, biogeochemical cycles, and many other things. In some directions, the feedback process can happen quickly and in others more slowly. At some point I may do a video on those feedback processes but it's not on the current drawing board.

[@medusa29897]

Woow

[@timdunk7278]

Very enlightening presentation. What is the reference textbook for the image at 43:25? Thank you.

[@rustyguts133]

Your lesson on Glaciers was excellent. And it makes me wonder if a person were to Gold Panning in the Moraine, would it be a spot where minerals could be found? I realize that the ice would have to pick up the minerals upslope from the moraine, but it is a thought

[@EarthandSpaceSciencesX]

Good question. The moraine-forming process is very poor at concentrating minerals, especially gold, but the glacial outwash rivers can begin that process and concentrate the gold downstream. That’s not to say that gold couldn’t accumulate in the pater noster lakes upgradient of the terminal moraine, but panning there probably wouldn’t be nearly as fruitful compared to much further downstream where natural processes concentrate gold.

[@shahabELDinshahab]

good lecture

[@digibotdotcom]

OK, at 44:02 you show the maximum extent of glaciation, but you used a graphic that doesn't even show the world famous "Driftless Area" centered in SW Wisconsin (where I live). No glacial deposits have ever been found there. It was missed by at least the last two glacial periods. It's an area of high plateau and Ordovician outcrops and rock features, including a couple outliers of Silurian age (West Blue Mound being the most spectacular of these).

[@valoriel4464]

Wow T bot, that is so interesting. nvr heard of this area. Excited to see if I can find additional info (pics) on this. Thx

[@jamesburke6078]

Don't think it's tree's, do think it's in the wobble and rotation of the 🌞! Change is constant...we need to get used to the idea...

[@plazmatest]

this video is great

[@TseyiHastiin]

Thanks, teach!

[@jamesburke6078]

Martha's vineyard? Isn't that we're i can get a bowl of fruit loops and a boat ride to the shore?

[@ahmedmohumedabdullahi]

I wanna the ppt lectures for all GEOLOGY courses

[@krellek888]

I haven't see the whole lecture but I stumbled upon two things: ice sheets do move, you have the largest velocities near the edges but even the interior moves. And also, ice in the Canadian Arctic is not part of the Greenland Ice Sheet, these are separate units.

[@EarthandSpaceSciencesX]

That's a fair criticism. I think I could have been clearer by saying that it is relative to the faster motion of glaciers.

[@ekbp3zpe760]

I guess you might say...cirques up

[@EarthandSpaceSciencesX]

Nice!

[@bruceh92]

The firn under a microscope is a collection of many, many colors. Anyone know what these colors represent?

[@percontatio9172]

Nice lecture! By the way piedmont means 'foot of mountain' in french.

[@percontatio9172]

.. and arête means ridge.

[@squirrelfrendotcom]

Also, what are your thoughts on the younger dryas impact theory? Very interested to hear your analysis of the current controversy, catastrophic vs gradual deposition

[@EarthandSpaceSciencesX]

I lean towards gradual. Catastrophism is valid for certain geologic events but it always requires extensive evidence to back it up and I think the evidence is weak for this event at this point.

[@bruceh92]

This is just good stuff to know. so I subscribed.

[@3runjosh]

31:52 almost had a slip up there mate 😬

[@tamib64]

Thank you for your lecture series! Can you please tell me the name and author of the textbook you use? Or recommend?

[@mickyjanse3947]

Very interesting. You speak clearly. Just one question, are you a teacher or...

[@EarthandSpaceSciencesX]

Professor of Geology and Environmental Science.

[@mickyjanse3947]

@@EarthandSpaceSciencesX thank you for your answer. I enjoy the lectures. And even I don't get a degree in geology, my knowledge grows. You refer to books in your lectures. What title(s) of books is it?

[@naakatube]

WHAT IS THE TEXTBOOK YOU USE?

[@lukestevenson6465]

I am probably drifting off the tangent. But you seem to be intelligible in this subject. Could you please answer this simple question for me? How much of the world's ice is below sea level? I am not able to find a reliable source for this information. Many thanks. Regards Luke.

[@suepowell1979]

Earth has cycles who would have thought... ;)

[@ahmedmohumedabdullahi]

Grade man

[@plazmatest]

he accidentally says bullshit at 31:51

[@JonFrumTheFirst]

Comment: 'regional global warming' is an oxymoron. Icebergs have always calved off of ice sheets - throughout the planet's cold periods. More snow inland would add weight to the ice sheet and cause it to move towards the sea, leaving more overhang and more iceberg formation. Warmer LOCAL temps could cause calving, but not increased average temps somewhere else on the globe.

[@jamesburke6078]

Can we get John Kerry to watch this? Just saying according to what you just said ice is supposed to be retreating...

[@aharreld2340]

So what is your "opinion" on anthropomorphic climate change? I've been noting that you very weirdly plug the coal and oil industry whenever you get a chance.

[@EarthandSpaceSciencesX]

I make no attempt to plug one industry or another. I was employed in private industry as an environmental geologist prior to taking my current teaching position, so I have no ties to these industries. One thing I do try to do is connect people to the earth through it's resources and that does mean discussing how and why we get these resources. It's a teaching technique that works well for me. My opinion, based upon research I have been involved in and from a preponderance of the published evidence, is that climate change is a real phenomena and that the rates of change have been increased due to human activity. However, I deal with the ethics and science of these issues in my environmental sciences courses more directly. If and when I post those lectures on this channel, I hope you'll take some time to review them for me.

[@jamesburke6078]

Let me say something intelligent...that trash pile of dropped glacial rock's look a lot like the great unconformity!

[@gregoriatayo1543]

Ioœll look