Geology 21 (Deserts)

[MasterMalrubius]

I really enjoy these videos. I took several geology classes back in college but went in another direction for my career. I still love learning about it!

[matthewsutton]

This a great series. Lecturer does a wonderful job covering the material at a nice pace.

[redolentblossom]

these videos are so helpful, i really appreciate you. these go so much more in depth than my online geol 101 class! i only wish that i found these earlier in the semester ):

[tvviewer]

Mr. Earth and Space Sciences X, you are a god. Thank you for this content.

[medea]

Thanks for another great lecture! Just a note - during 'ephemeral streams' at around 17:35 you mention _"African plants have not evolved as strongly the ability to live in deserts, as we see in Nth America... like cactus & these shrubs..."_ and that in Africa the _"dune fields are a consequence... because the plants haven't quite evolved yet."_ While it was probably unintentional, this isn't correct... plants in Africa & Australia have much longer evolutionary timelines in deserts than in Nth America, but more importantly they have evolved _different solutions to their unique environmental conditions._ Hence instead of succulents like cacti _above_ the ground, you'll get yams & cycads which store water in their roots _below_ the soil. The dormancy through dry periods with rapid genesis when water arrives (that you showed with the Nth African Wadi at 19:22) is another key example of a highly evolved life cycle for desert living. And they evolved these traits because of the drying of their environment & the encroachment of sand dunes over thousands of years, not the other way around.
It's a minor nitpick, but I've really enjoyed & got a lot from your lecture series so thought it was worth flagging in case you re-record this lecture in future 🧐👍

[PiracyAgreement]

The Sahel is also a good example of a steppe region

[jp]

Can wind make circular particles in the same way as water does to sand? If the sand in the desert is very circular and fine, is it possible for it to be shaped like that by wind transport? And is there any works that show evidence of it

[danoakes]

Can you tell me where I can visit the inselbergs in the US Professor? I enjoy your lectures, and would like to follow up with some site visits of the structures you describe.

[jonathanturek]

One of the coolest things are island climates.. Maui ( no ka oi ) has so many climate eco systems all within 20 miles from One another. You can take a drive and in one hour you go through coastal rain forest to desert to mtn eucalyptus forests to snow .. I hope the creator of video can visit Maui and experience this . and make a video ! Aloha

[lucianoerrico]

Wonderful video. Could you please suggest me a textbook (if it exists) covering all these lessons of geology? I would like to read properly about the environments you mentioned (volcanic areas, oceanic floors, glaciers, deserts…).

[MrGurushit]

What are your thoughts on the Salton Sea crisis between Riverside and Imperial Valley counties in Southern California.
Can you recycle calcium carbonate and phosphorus that is toxic (aka dead fish and birds).
Can you make concrete or cement from this material by adding another element like limestone?

[selmasu]

Thanks, also the dust from the desserts are very important to generate rain. right?

[thevenbede]

Wadi and water have no etymological relationship with each other

[harleyMnP]

Your room is so empty there is a lot of eco. Makes you kinna hard to understand. Espically the way I listen. I play the audio in my shop while I work. I use large speakers and fairly high volume. Just FYI. Great video!

[ikt]

Remember nullah, use lots of wadi when you wash your donga.

[annelabyu]

Who is here this 2025? Me starting my review for geologist board exam! 😊

[revelationtrain]

If u made documentaries I would finish your videos but lectures are boring for me

[able]

Oh, man, bad mike. Fix the sound or give it up. I’m serious.