/sci/ - Science & Math

[Anonymous No.8254737]

What would happen if we siphoned off the Earth's mantle?

[Anonymous No.8254747]

The moon would be set loose

[Anonymous No.8254910]

Presumably the crust would collapse and everybody would die.

I don't know if the collapse would release enough energy to liquefy the crust though

[Anonymous No.8254915]

>>8254910
You wouldn't be doing this instantaneously so I would assume that there would be large areas of devistation from earthquakes/folding of massive amounts of crust layers, large islands forming, possible extinction level event in most oceans from the toxic crap that comes out of the folds onto the surface. Other than that though we'd all be A-ok

[Anonymous No.8254967]

>>8254915
>>8254910
The core might also start to melt without the pressure of the mantle

[Anonymous No.8255336]

>>8254967
>implying the outer core isn't already molten

[Anonymous No.8255901]

We'd gradually lose our magnetic field and get bombarded with ionizing radiation.

[Anonymous No.8255943]

Tangentially related, I was reading a paper that proposes generating energy utilizing Earth's rotation through it's own magnetic field.

This was thought to be impossible, but using novel materials it actually may be doable. One one hand, this would provide clean cheap energy almost anywhere in the world. On the other hand, if this could actually work, we'd be sapping energy out of Earth's magnetic field or rotation, neither which seems particularly attractive (of course it would take a loooooooong time for changes to be noticeable).

[Anonymous No.8255948]

>>8254737
It would all of the into itself and then an alcohol

[Anonymous No.8255956]

>>8255943
>"using novel materials"
you mean using magic exotic material that doesn't exist, right?

how the hell are you going to generate power using earth's magnetic field if you're on earth and the magnetic field is rotating with you? take advantage of the minuscule change in field strength to drive some mini-dynamo and generate a microwatt of power over the course of a week?
pls

there's nothing cheap about what you're suggesting if you have to invent some shit and mass-produce it before you can start generating power, and you have no idea if the production process will be clean, or even energy efficient.

[Anonymous No.8255959]

>>8254737
What is the core made of, /sci/?

[Anonymous No.8255961]

>>8255948

[Anonymous No.8255967]

>>8255956
99.9% of the time I would call someone a crackpot on /sci/ for making such a claim. This is actually a legitimately interesting paper:

Electric Power Generation from Earth’s Rotation through its Own Magnetic Field
http://journals.aps.org/prapplied/abstract/10.1103/PhysRevApplied.6.014017

Unfortunately you'll need subscription access, but for university peeps that's not a problem.

The "magic exotic materials" that don't exist can potentially be engineered using metamaterials. If this works, even if the power generated is minuscule, simply add a bunch of such devices up in series and you can generate real power. Evidently Earth's surface and it's magnetic field don't rotate at exactly the same rate.

[Anonymous No.8255978]

>>8254737
Where would we put it?

[Anonymous No.8255983]

>>8254737
>He thinks the earth is not hollow

[Anonymous No.8255984]

>>8255959
Inner core is mostly Iron. It's what generates our magnetic field.

Fun fact: Elon Musk has proposed infusing Mars core with iron to make a magnetic field and create an atmosphere on Mars.

[Anonymous No.8255989]

>>8255961
>>8255948
lel

[Anonymous No.8255994]

>>8255967
sheeeeeeeiit

move over, solar roadways, i've got 100 cubic meters of magnetically permeable material in my basement costing roughly 2 million dollars and it can generate a WHOLE kilowatt every hour, all thanks to the laboratory-synthesized element memium

it's too bad the only source of naturally occurring memium-420 in the galaxy is planet X, which orbits outside the Kuiper belt in the region known as the 'dank sector'

and to think, people used to get their power from non-renewable non-meme resources

[Anonymous No.8255999]

>>8255994
I hate this board.

[Anonymous No.8256087]

Jesus Christ there is no mantle. Its a well known fact that the earth is flat, and anyone who says otherwise is just another person that has been brainwashed by public school systems.

I thought you guys were smarter than this.

[Anonymous No.8256096]

>>8255999
I thought it was funny

But would you please post the paper here, I don't have university access

[Anonymous No.8256114]

>>8255967
>has access to paper
>links rather than reuploads
dumb anon

[Anonymous No.8256130]

>>8256096
>>8256114
I'm sorry, I fucking hate the publishing model as it stands, but I will not do something that could land me in legal trouble.

[Anonymous No.8256140]

>>8256130
>not uploading it to MEGA and encrypting it to look like dolphin porn

[Anonymous No.8256142]

>>8256130
That's fair

But fingers crossed for someone that will

[Anonymous No.8257452]

>>8255967
>>8256114
>>8256130
>>8256140
>>8256142
It's on scihub you fucking mongoloids.

[Anonymous No.8258741]

>>8255984

Wait what? I call bullshit.

Surely Musk realises that's fucking retarded, practically speaking. How would you even get that much iron transported?

[Anonymous No.8258990]

>>8255984
>Fun fact: Elon Musk has proposed infusing Mars core with iron to make a magnetic field and create an atmosphere on Mars.
The absolute madman.

[Anonymous No.8259014]

>>8255901
>hi i failed geology but im gonna post anyways guys

the magnetosphere isnt generated in the mantle, einstein

[Anonymous No.8259017]

>>8258741
asteroids, son

[Anonymous No.8259514]

It would be extremely painful

[Anonymous No.8259523]

>>8255984
HOLY SHIT SOMEONE TELL ME WHY ARE WE STILL TAKING THIS FUCKING QUACK SERIOUSLY?
>fly a hundred people to mars on a rocket 3x the size of the saturn v
>build a martian city of millions by 2050
>fill the entire planet with iron to create earth 2.0
Beyond delusional

[Anonymous No.8259559]

I wrote a paper about Ground Subsidence for my Gelogical Hazards class last year. Ground subsidence is the first geological disaster caused by humans.

As we pump ground water out of the earth the layers of rock from which we pump the water collapse. This picture shows how much the Central Valley of California has fallen between 1925 and 1977 (it's fallen a lot further since) because of all the water we've pumped from the water table.

Ground Subsidence causes fissuring as softer sedimentary layers pull away from harder bedrock. This has destroyed whole communities in Arizona (look it up) and threatens many other communities in the American Southwest.

The same thing would happen if we .... uh, "siphoned off" the mantle. First of all, forget whatever you've been taught and your picture is wrong. The mantle is not molten nor orange. It's hard, rigid, and green. When mantle rock makes it to the surface (which is extremely rare but there are places such as the island of Crete) it cools into the rock Peridotite. The mantle is made up of Olivine, Orthopyroxine, Clinopyroxine, and Spinel. The olivine gives it the green color. The mantle only behaves as a liquid on long geological timescales (and then EVERYTHING behaves as a liquid). The mantle moves about as fast as your fingernails grow.

You cannot 'siphon' it off.

[Anonymous No.8259562]

>>8259559
A picture of Peridotite. This is the color of the mantle.

Hope you learned something OP

[Anonymous No.8259574]

>>8259559
>>8259562
Not OP but I do appreciate the explanation on the mantel, and such.

How exactly did they measure that ground subsidence? I mean you see on that picture that it looks relatively straight. So, I would assume that the ground subsided along the span of dozens of kilometers.

[Anonymous No.8259581]

Where is the mantle material being syphoned into? The atmosphere or space?

[Anonymous No.8259586]

>>8259574
I haven't got even the slightest clue how they made that pole like they did. I know today that we measure ground subsidence by satellite and LiDAR but we obviously didn't have those technologies in 1925. Sure there's other ways to measure how much the ground moves but I have no idea what they did.

We are destroying whole communities in the American Southwest by overpumping our water table to feed non native plants that can't otherwise grow in the area instead of say, planting more crops that CAN naturally live there. But it's all about money and who cares about the little people?

[Anonymous No.8259750]

>>8259559
>>8259562
Wouldn't the mantle still be visibly red or other hot colors because of black body radiation?

[Anonymous No.8259753]

>>8259586
not to mention they have certainly passed peak water already

[Anonymous No.8259891]

>>8259750
that's a good point actually. I suppose you could heat up peridotite and see. I've never tried.

[Anonymous No.8259914]

>>8259750
I'm not a geologist, but according to: https://en.wikipedia.org/wiki/Mantle_(geology)#Temperature it goes from around 500°C near the crust to over 4000°C, so it's around 773 to 4273 kelvins. Light bulb's filament has a temperature below 3695 K, as it's the melting point of tungsten. So ignoring concerns like emissivity, I think it's a good guess that the inner mantle would glow, but the outer mantle would likely emit mostly infrared. For 773.15 K the wavelength of the peak emission for a black body would be:
[math]14387.770 \text{ }\mu\text{m}\text{K} \cdot \frac{1}{773.15\text{ K}} \approx 18.6\text{ }\mu\text{m}[/math]
and that's well into infrared. (https://en.wikipedia.org/wiki/Planck%27s_law#Peaks))

[Anonymous No.8259922]

We would have enugh gas for all the cars

[Anonymous No.8259935]

>>8259586
strong

[Anonymous No.8259970]

>>8259914
Alright

[Anonymous No.8260039]

>>8259914
>but the outer mantle would likely emit mostly infrared
So the outer mantle would simply be hot? And it would look green like pictured above I take it. And as you approach the core it gets more hot until it starts glowing. So the picture is right in a sense that it's orangey in color down there.

[Anonymous No.8260056]

>>8260039
>So the outer mantle would simply be hot?
Well, there are ovens that go up to 500°C. Mine doesn't, so I can't check if it's enough to glow. I don't know what would be the temperature of glowing coal, for example, but I've seen a heater of an electric barbecue glow in dim red, and that could have a temperature comparable to an oven. So I guess it could have the color of the heater in pic related.

[Anonymous No.8260074]

>>8260056
... but I have no idea how would that combine with the green color of the rocks.

[Anonymous No.8260091]

>>8260074
I don't know m8, but every picture I can find is pretty similar to this one. The outer mantle looks almost exactly like that heater. Which would make sense since they're both at around 500 C. And as you go down and temperature rises the color changes

[Anonymous No.8260108]

>>8260091
Well yeah but this anon: >>8259562 posted the mantle rock at room temperature. At 4000°C or so it probably wouldn't matter what color it is normally, but at 500°C it could, I think. And I doubt that these kind of diagrams are made with visual accuracy in mind, I think they're just meant to show the changes in temperature.

[Anonymous No.8260111]

You can't siphon something if you're at a higher altitude (or further away from the center of the earth) than the reservoir. To siphon the mantle you would have to be in the core.

[Anonymous No.8260182]

>>8260108
Yea, but the rock is high in magnesium and some iron. AFAIK Iron glows reddish at 500 C.

[Anonymous No.8260197]

>>8260182
But metallic iron is grey, so all the hue comes from the radiation. Green rocks would contribute more to the final color than iron.

[Anonymous No.8260261]

>>8255943
>made that pole like they did. I know today that we measure ground subsid


If those novel matrials are stong enough, we may as well make a space elevator with them.

[Anonymous No.8260352]

>>8259514
You're a big planet

[Anonymous No.8260377]

>>8255948

what did he mean by this?

[Anonymous No.8260393]

>>8254737
It would look neato. That's what would happen. That's all that would happen. Ever.

[Anonymous No.8260542]

>>8260111
>siphoning solid, rigid, superheated rock
You can't anyway.

[Anonymous No.8260560]

>>8260377
It was from a thread on /b/ earlier today if I'm not mistaken

[Anonymous No.8260646]

>>8255948
> It would all of the into itself and then an alcohol
... What?

[Anonymous No.8261009]

>>8255948
this man knows

[Anonymous No.8261738]

>>8254737
Do you mean Geothermal energy? Ask the people of Iceland.