@@stringsnare thanks Bruv! It takes a special person to know the power of a solid roof rack. I can haul almost a ton on this thang!

Those areas have an incoming flow down into the poles of the Earth. If there was no magnetic field the atmosphere would be wiped off into space.

@MrMoose123 thank you, I know that,

Here’s a great description on that www.nationalgeographic.com/science/article/magnetic-north-update-navigation-maps

When the medics do an MRI scan they can see your internal structure and organs without "digging" into you. In your case they probably couldn't locate grey matter however.

@@karhukivi False equivalence logical fallacy^^ we've still dissected the human body to see what its like inside. We haven't for the earth. Also, the human body isnt thousands of miles deep....

@@Awakeintheaether You never heard of seismic tomography using earthquakes? How shear waves don't pass through the liquid Core, while compressional ones do? Never heard of magneto-tellurics? Never heard of angular momentum, or the density of the Earth? So what do you think the interior of the Earth is made of?

@@karhukivi Thats like you saying the bible is bullshit and me replying with, "oh yea??! Ever hear of the 10 commandments? Noah's ark?? Jesus Christ?? All the expert priests who went to seminary school agree with it."

@@Awakeintheaether Well, what do YOU think is inside the earth?

Cough cough, where did you hear about chromium in this lecture??? Stainless steel is reliant on chromium oxide to shield the surface from further ‘rusting’ and many alloys of stainless ARE magnetic. I think as a typical couch potato critic in your haste doesn’t know anything about geophysics, if you did you’d realize that all this is theoretical since it is ALL estimates from sound waves velocities. Crawl back under your pedantic rock and go troll someone else!

Many meteorites are nickel-iron alloy and are strongly magnetic. They are common (although hard to find) and they fit all the seismic, density and electrical conductivity parameters that we know exist in the core from geophysical studies. What do you think is in the interior of the earth? gold? chocolate?

@@karhukivi LOL heat them to molten then check your magnetism. A cold meteorite may be magnetic. Not a glowing hot one. As for the interior nothing can be proven. The deepest hole ever drilled is less the 8 miles.

@@dcummings7253 Very true, but the Earth's magnetic field does not come from a ferromagnetic material, it is produced by a circulating conductive liquid and the self-exciting dynamo effect, which incidentally is how most electric generators work. The worldwide network of seismic stations monitor earthquakes (and illegal underground nuclear tests) and these prove that the interior of the earth has a liquid core as shear waves don't pass through non-rigid liquids. We know the mass of the earth from gravity data and the volume from the dimensions, so we know the average density which is a lot higher than even mantle rocks, so we know the Core is a metallic liquid. What do you think it could be - mercury? gold? Irn-nickel ticks all the boxes and is common in the asteroid belt, so the most likely candidate. That is how science works, using evidence, and not based on "beliefs" which is what religions do.

@@karhukivi Well your faith in your science. If no different then my faith in the Creation and what I believe was all explained in Genesis. And to me is not explained away with your faulty science. Psalm 104:5 He established the earth upon its foundations, So that it will not totter forever and ever. Genesis 1:7-9 And God made the firmament, and divided the waters which were under the firmament from the waters which were above the firmament: and it was so. So no there is no center the Earth is a level plain.

Thank you for your appreciation! This video is the last time I did this. Now that age is catching up with me I’ve started looking for a bandsaw mill. Even with a peavy flipping logs and loading fat slabs gets tiring…

It happen inside most electrical generators, they have "field coils" and generate a magnetic field in the same was as is explained here, which is why he has an image of such a generator!

Thank you! That demo was so much fun. I wish I had a camera on the students all plugging their ears from the previous universe ballon demo!

They're prolly taking this class to fill a credit

My dad and I have a small wood/metal shop that doesn’t use much mesquite annually but in the dry Arizona heat it only takes a couple summers for a 4” thick slab to be dry in the core. We do have a moisture meter so when I’m planing or jointing a slab I check with the meter to make sure middle is dry before diving in to a big project.