Structure of the Earth

[INMATE2468]

I thought this was astronomy and cosmology not geological lol

[Nadiarocksart]

I am doing Physical Science this year for school, and i'm usuing the apologia book 2nd edition, and i was reading Module 6 and i didn't totally get it, so i watched this and i got it, like really really got it. Thanks so much, Was hoping you could do a video on the factors that affect the earth's air? Again thank you so so much :)

[imtosexyformyself]

@petventures Experiences in the lab. Scientists and Geologists, etc. Used the information they had (through observation and such) and did small scale tests to figure out the 'inside' of the globe. For example, they know of the S, P and L waves. Through a series of tests they realized that S waves only went through solids which they linked to certain 'irregularities' concluding that if S waves momentarily disappeared, then that meant that there was something in the earth that was in liquid form.

[tIs4gatorbait]

same core makeup of large stars. interesting

[tIs4gatorbait]

but sal, blue is hotter than red!

[ipkeez]

Under the Crust there is Dement-all, that means Yes! there is a civilization living there, and they are all Dement-ed. :-D

[FistsofVengeance]

but technically at the centre of the earth, gravity cancels out

[HaloReachSpot]

This is so Elementary....

[valkiris]

Wait, I thought there was another civilization living inside the earth? One far more advanced than us.

[homousios]

@valkiris there is ufos come from there

[f00f1ght3rs12]

I wish i lived on earth.... But i live in canada :(

[tttybhgf]

Is the oceanic crust below the continental crust ? or are they at the same level ?

[hedonism13]

@tttybhgf

Oceanic Crust is any crust beneath the ocean, while continental crust is crust on land... so oceanic crust can be thought of as below continental crust...

[petventures]

I would like to know how this information came to be known.. Was this observed in some exploratory venture?

[jpr422]

@petventures Check out this web page: pubs.usgs.gov/gip/interior. I hope this helps.

[lsefia]

interesting

[cmxcmx]

This is quite interesting.

About the pressure in the core, I'm sort of confused. The total gravity in the exact center of the earth would be more or less zero since you get "pulled on" from all directions more or less equally. But the pressure from "above" (that is, all around you) is huge. Can you explain that some more? I'm not sure I get how the paradox is resolved.

[FHomeBrew]

How much gold is in the core? My physics teacher said it was enough to cover all of the landmass with three feet of solid gold...

[ILockItDown]

@FHomeBrew you can't know for sure, you can't put an accurate guess either until the whole world has been mapped by each countries respective geological survey to even guess at possible gold storage areas, putting it simply

[FHomeBrew]

@ILockItDown I liked my teachers estimate though. We wouldn't be richer because gold would be pretty worthless.

[ILockItDown]

@FHomeBrew answer me this, why is gold worth anything rite now? :)

[invisible0tom]

Nicely timed with my new topic - learning plate tectonics in geography!

Oh and THANK YOU (I need bigger capitals) for the respiration/photosynthesis videos.

[TheRealLachlan]

Thanks for the Geology vid, Sal. You're amazing. I hope you'll do more. It's such an interesting subject.

[steamsword1]

EARTH.

[HTR2A]

yay another earth vid, gotta love that place :)