I really wish you had been my teacher (any subject). You are captivating. You have opened up a whole new world for me as I inch closer to 70. I'm loving it. Thank you.
As a new person to geology, each lecture I have questions and the next lecture answers them. Each lecture I'm telling "oh WOW" Thank you again Professor Zentner for sharing this with all of us!!!
The complete joy these lectures have given me is immense. Kudos to student Mason, he isn't just a brown nose, you can tell you are his favorite professor and you have grabbed his attention so well. I hope he did well in your class. I hope he does well in the field of geology. I feel a mini Zentner in him
Nick I worked out on the Aleutian in the early 1970s. We sunk a 6200 ft mine shaft on the island of Amchitka for a nuclear bomb test. The rock we mined was basalt and the temperature was very hot so we could not stay at the bottom of the shaft over 4 hours. We survived by drinking gallons of Gatorade.
Every previous gush from me? I mean it, and more. I work with some younger folks and am familiar with teaching them their jobs and keep them on task. So I'm picking up some great pointers! More lessons sandwiched between geology! You gotta love it!
Well, 'something' happened ... woke up in my chair to find the livestream ended ... hope it was good for you. Thanks Nick (?). Will watch replay to see what I missed. ... Grumble, grumble. ;
Gondwana asked WHY DO WE HAVE GRANITE AT THE CORE OF THE C-C COLLISION? My understanding is that the magma that occurs at a c-c site does not rise above the surface; therefore, it cools slowly underground into large-grained granite. In the o-c and o-o sites, the magma does rise above the surface (as volcanoes); therefore, it cools quickly above-ground as fine-grained andesite if on a continental arc or fine-grained basalt (or andesite) if on an island arc.
In 1956 eight year old me on the occasion of my father hanging the huge National Geographic map of the world on the kitchen wall. “Hey, it looks like the New World usta’ be right up next to England and Africa!” I just knew it!
Nick I worked out on the Aleutian Islands on the island of them check out in the 1970s. We were doing a nuclear test the mineshaft was 6200 feet deep. The rock type was basalt
@@benwinkel we never re-entry the bomb site. By down at the Nevada Test site we did re-entry a few of the bomb test. One I remember was 1500ft shaft and tunnel complex. The tunnel complex was back filled with quartz sand, the tunnel was about 10ft by 10ft. After the test the surface elevation raised about 15ft. The quartz back fill sand was metamorphic to quartzite rock. The 10 by 10 foot tunnel had been compressed to about 3 by 3 feet, the country rock was Granodiorite. We mined right back to ground zero it was one of the toughest mining experience of my life. We were luckily to mine one foot in 24 hr once we were in blast cavity.
Nick, I think you may have more LL Bean shirts than me. They're a great shirt, wear like iron, don't require pressing. You can wear them anywhere and be appropriate.
Late again, does that mean I'll lose points in Their test, lol! Got LL Bean shirts too, but buy Bass Pro shop fishing shirts, breath and let air circulate and roomy. I have a bunch of Red Banana's for riding my motorcycle. Great for keeping bugs out you teeth, shouldn't smile while riding!!! Class getting more talkative!
*ZOOM?* Streaming seems to be a better match given the number of Zingon townies in the 11-month old community. FGS! Let the man have some "me" time with the family.
The NA plate is currently plowing through the weaker ocean crust and it's still going on all along it on large, southern California is only translating temporarily. The Alaska/Russia continental collision is interesting for a few reasons, there are no mountains at the collision so it is recent. That straight may have been wide enough to allow a Pacific current to circulate in the Artic 10 million years ago and might be an ice age tipping point. Second it is a pivot point for some rotational stress on the much larger NA continent and the Gulf of Alaska seems to be at a stress point of that potential rotation.
There seems to be a contradiction about slabs - seismic tomography shows some slabs folding up at the bottom of the mantle but melting slabs provide magma for volcanoes. Would that explain the irregular eruption patterns for the Cascade volcanoes?
When two ocean plates collide, is there normally subduction with a trench? Why does one ocean plate dive, while the other rides up and over? Can one ocean plate have subduction, to later be subducted by the other ocean plate?
i got a question about the Chinese supervolcano. I saw a youtube suggesting that the pacific plate is subducting under the Chinese one. At some point instead of going straight down, it bends level with the earth. I have an idea that it runs into a former plate that is denser. and that is the reason for the reverse bend. is that a reasonable theory?
Hey, Nick, Kurt from Longmont, Colorado here. Old guys like us like LL Bean cause they're comfortable. I wear their soft fleece "sweaters all winter. Have you heard the old joke about the adult-only funhouse on top of the him-all-A-in (Himalyan) mountains? There's a guy in the house on top, a guy climbing up the mountain, and a guy walking down the mountain. Based only on this information, what are the nationalities of these three men?
I have it on good authority that it is not a scarf, it is not a bandana, it is not a neckerchief. It is a SNOT RAG. I had a kerchief as a kid and my grandfather asked me to borrow my "snot rag" so he could blow his nose. Well, who was I to turn down my beloved grandfather. I asked him why he preferred "snot rag," he just said well, that's what it's for, so.... If I had been more bold and less deferential I would've said "Get your own!"
Really!! You’re from Wisconsin and you’re wearing L. L. Bean instead of Lands’ End? I was born and raised in Chicago, but have lived in SoCal for the past 40 yrs, and still love Lands’ End clothing even after Sears bought them.
Ocean vs Continent: Imagine a low to the ground Lamborghini crashing head on into a fully loaded Semi-Truck. Who wins? What happens to the the car as it passes under the truck? It gets broken down and destroyed. That is how my brain works to remember things. Analogies. Subduction: Sub floor(ocean) ducking under the main floor(continent).
For the quick-to-block ... No I'm not speaking of your bowel ... ellipses (...) indicate there is more to come ... as in the sarcastic wit that is apparent if you are paying attention ... The idea of using 40Ar/39Ar (Argon/Argon) dating to "prove" the earth is 6050 yrs rather than 6000 yrs ... is funny because Ar-Ar dating is superior (more significant figures) to 40K-40Ar (Potassium/Argon) dating. Both methods prove unequivocally the earth is billions old ... but the flat-earth types bash science until they think the science is on their side. So I tossed out a lure ... it's mockery well over their flat heads ... and apparently over the heads of 3DNorthwoods and at least one other townie. To announce and encourage blocking a fellow townie through one's ignorance is sad ... I hoped for more from a wall ... covered in flies ... maybe a sweet sticky wall covered in white chocolate ... not just fly paper.
