I'm a little late to the game here, But one question asked, I believe by Gavin...Made me think of Kilauea's 2018 eruption. Most of the lava in the beginning of the eruption was found to have erupted through magma left behind from an eruption in the 1950's. Out of the 24 fissures that emerged though, one in particular stood out to everyone: Fissure 17! Apparently it had erupted through magma MUCH older. Possibly hundreds of years old, and they actually found chemical traces for andesite. I'm not sure if that actually answered the question, but Fissure 17 was what immediately came to mind.

@smeegle213

3 жыл бұрын

kzread.info/dash/bejne/jI2DusSqlr2fpsY.html&ab_channel=LiveStormsMedia I believe Fissures 16 through 20 are in this video. You can really see (and hear) the differences. Fissure 17 is the one that goes BOOM! :P

@stormforce171

3 жыл бұрын

Yes that is correct. This USGS presentation discusses the eruption and fissure 17 from 11.30 minutes into the video: kzread.info/dash/bejne/ammLuseSZLibZso.html

Nick, All the technology of the internet is just cats and porn without characters like you. I have to thank you for your live streams, Some of the best work I've seen in internet education.

@acs197

3 жыл бұрын

Hear, hear!

You go on about how boring this is, but honestly, this is the first time I've seen someone lay out the grammar of igneous rocks. And I grew up going to Yosemite every summer! I read these Roadside Geology books and they spew out all these words, but it's like reading Hebrew - backwards and in a different script! I teach finance and regularly I have to explain to new students the basic difference between dividends and capital gains vs interest. It seems so obvious to me, but students come in and they've heard the words. They bought a car & taken out a loan. But they never thought about what the words, dividend and interest mean in terms of risk, reward, cashflow timing, taxes, obligations and ownership. So similarly this is the grammar of geology and knowing the grammar is basic to understanding what it all means. Thank you for going through this! As I said, for all my reading, I've never seen it laid out so clearly.

You are like if Bill Nye wasn't an asshole and if Mr Rogers was a scientific expert. I really appreciate how gentle you are with your audience and that you tell us you love us. We love you too!

@GeologyNick

4 жыл бұрын

I love you, Hollis, for this hilarious comment.

The obsidian with red or orange in it is called Mahogany Obsidian.

Nick, stop worrying about a little shade. We can still see everything just fine. Thanks for being so awesome.

I tickled me to watch Nick drinking from a glass of water containing pumice and tephra. The obvious line is 'water on the rocks'.

Thanks Nick, love what you are doing!

Missed it live. Dagnabit! Got stuck working on motorcycles in a buddies garage. It went on longer than expected. Beer was involved. Loved seeing all the gifts (spiced almonds are the bomb!). I need to get back to watching this, and expanding my brain beyond muffler stuff. Having a COOKIE QUAKE IN MY BELLY will likely help with being randomly deranged. Great show as always. Cheers!

@KathyWilliamsDevries

4 жыл бұрын

Kid Katabatic we missed you!

@luthermclain2959

4 жыл бұрын

@@KathyWilliamsDevries Thanks Kathy! I'll be there from here on on in, barring random unforeseen global events like having to return to work. That's gonna be a major dagnabit moment. Don't want think about it, but it's looming.

Thank you for the basics. All new to me! Will be watching these again. 👍🌸🧡

watching some over and over. This vid is one of your best

Missed live watching after the fact! This is great.

On workdays. It is hard to watch in the middle of the night, so watching later, sorry Nick, from the Netherlands

Professor Zentner. you are a very honest person especially when you admit that you don't know or have an answer to a question; you've got to love it. It's Crystobalite that forms the "snowflakes" in Obsidian. Thank you.

This video was in my KZread recommended page... I think igneous rocks too!

Pretty soon the whole neighborhood is going to show up! :D I would!

Riveting. Australia. Rock on!

Learned loads. Thank you for all that. Cheers from Jane in the UK.

Nick on the Sauce, lol ✌ Good stuff 👍

Always an entertaining teacher, thanks from Australia.🍺🤓🇦🇺

Ohhhhh. Aha! Thanks Prof Nick. You are swell. All I know about monzonite, is that it's a nifty sounding word especially the Monza part, and that it is used in every sentence describing Yosemite's Half Dome formation in my 1974 copy of N. CAL by Harbaugh.

from that fisheye you gave us in closing, I don't that toast was water, Nick...😜

Missed the live version this evening, but catching up! Thanks Nick!

You make rocks entertaining. Thanks for the knowledge

I'm glad that I can watch this one again. I'm thinking about too many other things that I have to do than sit and watch this. . Popcorn brain today.

Like this a lot.

Wahoo!!! One of my favorite topics ever!

I watch this for the third time

Late to the party by a couple of years, but I’m learning so much!

Awesome video and entertaining. Thank you

Gavin had a question about phenocrysts forming in the pluton to show in porphyritic rocks. I was wondering if there is a connection to a older magma being pushed out by a lower hotter magma. There is a great USGS video describing the eruption sequence in the 2018 Hawaii east rift zone, where they speak of the initial flow as slow and then that thicker lava is pushed out and a fast moving lava then flows like water.

The "snowflakes" in Snowflake Obsidian is a mineral called cristobalite. Cristobalite has the same chemical formula as quartz (SiO2) but has a different crystalline structure. I bet the answer came to you the minute the video was over.

Nice explanation

Hard as an old cookie ? :) I love your examples.

There are some large heavy boulders that are either basalt of gabbro as I was not sure . still am not. had another look today after watching the video this morning. they were being worked on by some sculptors . There are large rusty looking faces , which must be the iron now that Ive seen this video. But the boulders also have some foliating whitish bands , so this must be a metamorphic at least in part, if that's possible.

Love the giant cookies.

The Texas Capitol is made of pink granite quarried in Marble Falls, TX, a town my great, great grandfather founded. The town is a misnomer since all the rock is granite.

best teacher I get it!

I think obsidian doesn't have cleavage planes cuz it cools super fast upon eruption, forming a glass. Hence the conchoidal fractures.

WHY DOES BASALT ROCK GROW PLANTS SO WELL?

Less hardcore Europeans watch a bit later 😁 regards from NL

when you teach you learn twice

Nick Zenter are you now World Famous?

Bowens Reaction Series. Old People Are Best.

One of The Rock's you held up before you were defining appeared to be amygdaloidal, was it rhyolite or basalt?

Where in Washington can you find the coarstest structured rock from magma chamber?

Hi Nick. I realize I'm way behind you and understand if you don't answer this. I don't understand how, as molten material cools, how do minerals decide what they what to be. Is it related to % silica? Please forgive my simple mind. Thank you!

@EMarcisz32

Жыл бұрын

yup, depending on silica content the molten lava will cool into quartz/feldspar (lots of silica), periodate/olivine/micas (low silica), or hornblende/? (medium silica) :)

Basalt on the left? There will be pushback.

It's a beautiful day in ellensburg 😂😂😂🎶🎶🎙🎶🎙 tired of Mr Rodgers lololol 😅😅😅

What about Catalina Island? 26 miles across the sea. .

1:12 of course you go left to right. Its west coast geology. Ocean, Coast, Continent

@wendygerrish4964

2 жыл бұрын

Ofcourse! That's a tell as to where the geologists are from.

No subtitle Michael O’Brien?

@bagoquarks

4 жыл бұрын

Sometimes less on my part (or nothing) is more. Nick was focused tonight; I'm just a freshman in the back row cramming for the midterm.

I'm sure Liz was annoyed that you took a bite out of every cookie in the box and left none for her!😢😢

Watching from New Braunfels, Texas - mgould100 on youtube

Minerals rock...lol

I need the rules AND see rocks rules please, from Northwestern Nevada

Ow, my brain hurts! It reminds me of a story: Sherlock Holmes and Dr. Watson went on a camping trip. They decided to set up their camp site and go to sleep early. In the early morning hours Sherlock Holmes nudged Dr. Watson awake, "....Watson, take a look at the stars and tell me what you deduce..." Dr. Watson took awhile to explain the stars were actually suns with, possibly, several planets orbiting them. "....Therefore, with so many other 'solar systems' out there - we cannot be alone in the Universe." Sherlock replied, "Watson you idiot! -- _Someone stole our tent!!..."_ :smileywink: 😉 If the data has been processed properly, _Obsidian_ is an igneous, volcanic, felsic, aphanitic textured, form of Rhyolite. Feels like something was left out....no wonder Prof. Nick doesn't seem to care about "naming." ....don't blame him. To partially answer "Evelyn's" question about "snowflake obsidian," the snowflakes are a type of quartz crystal. This occurs as a product of aging. Thus, snowflake obsidian is old or aged. Nothing viewed gave specific numbers, one source said no obsidian is older than the Cretaceous period (ended ~65 million years ago). Most Internet sites searched are about healing properties (be very skeptical) and its use in jewelry. Long story short, obsidian has been an important resource, to Man, for hundreds of thousands - possibly millions - of years. It's use today is mostly as a semi-precious gem stone. In its deteriorated form, _pearlite,_ it's a useful addition to, or substitute for soil. In other words, _pearlite_ helps to grow healthy plants. For other questions see: duckduckgo.com/?&q=conchoidal+fracture&ia=web or duckduckgo.com/ then, type in "conchoidal fracture" and click on the search icon (tiny leaning magnifying glass) or press the "Enter" key on the keyboard (I don't use touch screens or smart phones...sue me...😉). No more Obsidian, I'm burned out...

My Gene (not your "Gene" the cookie person. .. although iwe live very close to Puyallup) came up with Swiss cheese analogy a second faster than you! Porphyritic textured ingenious rock.

Mr Rogers on clevage/cracks wahaha

the minerals are randomly arranged....

WHAT ARE CONGLOMERATE ROCKS COMPOSED OF?

@davidwatson8118

3 жыл бұрын

Other rocks

Lowest silica magmas on this planet are NOT 45%. Lowest silica magmas come from places like Nyiragongo and can go as low as 36% silica. Then of course we have carbonatite magmas which have 0% silica content because they're based on a fundamentally different chemistry.

It's gneiss. Don't take it for granite.

I am a bot !

IF MAGMA COMES UP FROM THE MANTLE, WHY DOESN'T ALL MAGMA THE SAME AMOUNT OF SILICA?

@wtglb

4 жыл бұрын

My guess is it has something to do with the composition of the material it melts through on the way to the surface

@ginfonte3386

3 жыл бұрын

Another guess is the HUGE magma chamber(s) within the earth is not homogeneous.

@davidpnewton

2 жыл бұрын

Fractional crystalisation. Assimilation of surrounding rocks into the melt. Mixing of different magma bodies.

Ah we missed an opportunity. Why high content silicas in the middle of land and low silica content in the middle of the ocean?

If we measure ancient, igneous rock, for silica, it will tell you how far away from water it formed. Therefore a map of how the earth grew.

U alcoholics r hilarious

If not crystals then what forms from explosion? Not nothing. You aren't going to tell me there are no explosions in the earth. Ha, we have earthquakes all day long. It's not possible to have earth movement without explosion and therefore crystals are formed all day long.

So much bs something is wrong here nothing about rocks