Seismic waves | Earth geological and climatic history | Cosmology & Astronomy | Khan Academy

S-waves and P-waves. Created by Sal Khan.

Cosmology & Astronomy on Khan Academy: The Earth is huge, but it is tiny compared to the Sun (which is super huge). But the Sun is tiny compared to the solar system which is tiny compared to the distance to the next star. Oh, did we mention that there are over 100 billion stars in our galaxy (which is about 100,000 light years in diameter) which is one of hundreds of billions of galaxies in just the observable universe (which might be infinite for all we know). Don't feel small. We find it liberating. Your everyday human stresses are nothing compared to this enormity that we are a part of. Enjoy the fact that we get to be part of this vastness!

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[rajeevnaik]

There are ton of videos/animations/lectures on youtube that show these waves who basically tell stuff printed in textbooks or animate them but nothing comes closer to the details in this video. Sal is just brilliant. Once in a millenia kind of guy.
Actually showin the direction of P and S waves from bottom to top is the most important detail that all other videos missed. Amazing

[medicineman]

I learned more from an eight minute video than I did in
two days of class lecture...thanks a lot!!!

[Felipe-twwg]

8:04 just a little glitch in the matrix haha
Such a good video, I understood my 1 hour lecture in under 9 minutes, love this videos.

[faeries_Wear_Boots]

Khan University I love you! Again, have successfully helped me understand things my brain could wrap around before, now understand! Thank you!

[PonquecitoMortal]

I love this kind of explanations, thanks <3

[bonnieaakermann]

Thankyou this video was extremely useful in my assessment

[ihavenomouthandimustscream]

This easier to understand than my textbook. :)

[pithikoulis]

cool videos Sal! I was just watching your video on the binomial theorem and now for no reason I got some new knowledge on S-waves and earthquakes :D

[furrycannedcheese]

Very Very helpful! THANKS SO MUCH!! :D

[VAA]

Great job!!!! thank you very much. My little girl now has full understanding of the waves (thanks to you).

Thanks again :)

[joshuavolfson]

Thanks, you really helped me better understand the material on my test. Next time I'm stuck I'll be sure to come here, and tell my friends about you. Thanks :)

[bowanida]

Thank you! It's really great lecture

[peacefulword]

what don't you know, i mean seriously dude

[benreece]

You could use a Pool Noodle. Those floatation devices that look like a day glow two meter noodle. You can shake your noodle and make waves in the noodle, or you can push the noodle for those fast in line of material waves.

[snowmanvcz]

This is my Grade Savior
I passed my exam cause of this

[imteyazansari]

Love wave_make you moving left & right.😉

[freezinganimenz]

i think i'll do well in my geography test now

[brownclorox]

Hope you don't mind me asking, but what are your credentials?

Are you a P.E. in Civil Engineering or a Structural Engineer? Seismologist? Geologist? 

Thanks!!

[RAMOFFICIALF]

5:24 I have a doubt if we hit the rock as shown and do to emense pressure the rock gets off then
Please give the answer

[Invaderzerg]

what about a seismic wave travelling in a steel beams, originated from nuclear underground blast? can that turn the steel into dust?