Magnetic Striping and Seafloor Spreading
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- เผยแพร่เมื่อ 26 ก.ย. 2024
- The discovery of magnetic stripes in oceanic crust and how this supports Wegener's Theory of Continental Drift or, as we now know it, Plate Tectonics! Presented by Ruth Kirk.
Made for Education Perfect Ltd. All imagery used with licence.
Music attribution:
Clean Soul - Calming by Kevin MacLeod is licensed under a Creative Commons Attribution license (creativecommon...)
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5 years later and still helping students! Insane video. Thank you!
using this to do my overdue online assignments, anyone else?
Yup
Yup
yup
this is my online assignment
yup
nice but why ar you blowing on the mcrophone you are too close
true lol
I’m doing a science homework about this video and it was easy to understand
i know it's been a year but can u explain it a bit simpler bc i still do not get it
Music got no business being this good
Great vid
Anyone here because of science?
Yessir
OK so pretty much I’ve been trying to figure out how magnetic stripes support the idea of sea floor spreading, and now I get it. I think. So pretty much Magnetic stiles are formed from magma from convection currents beneath the mantle. This then solidifies snd hardens, but records the Normal or Reverse Polarity. This helps support the idea of Sea floor spreading because it shows 1. The age of the rock is newer, so new material must currently be produced, and 2. Since the age is younger and the polarity (should) be closer to our polarity that means the sea floor has to be “created” . Please correct me if I’m wrong
Loved it mam
How true, simple and honest
move back from the microphone, you're super close to it
I can hear her breathing
Hi Adrian, thanks for pointing that out. I'm aiming to improve the audio quality of these videos going forward. :)
@@ThomasStevensontutor good video tho. Informative and good narration. Just hard to take notes on. I get assigned to take notes on videos like this as homework all the time, and it's a little harder to understand and take notes on when there arent main outlines. Like clearly stating the main point, what's important to remember and understand.
Well described
this has rlly helped me with my science study, but yeah u r a bit close to the mic
but great video
Great video
So we have evidence frozen in the sea floor. What is the effect of these periodic reversal on earth. The magnetic field is a shield protecting earth from solar wind and cosmic rays. Is that protection supplied by the magnetic field periodically reduced or eliminated. How much, and for how long? What would be it’s impact on the existing life forms and would extinctions or large scale mutations be a result?
You did not say what is the magnetic anomaly made of? were the rocks flipped or pointing north? what the magnetic strips made of?
These rocks contain tiny grains of magnetite and other iron-based minerals, which are naturally magnetic. When the rocks are in a molten state - lava - those grains can rotate freely and point in the direction of Magnetic North at that time.
Then, the lava solidifies and those grains are stuck in the same orientation forever. It's the Earth's magnetic field itself that has flipped back and forth many times throughout geological history.
This is also why magnetic stripes are not usually noticeable on land; most rocks in the continental crust are not magnetic!
Does this answer your question?
@@ThomasStevensontutor yes great answer thank you very much
Fossil records show validity to Wegeners theories as well, but again, more so after he died.
Poses the questions, how are these stipes so evenly spaced along the ridge... Why not simply several volcanic cones?... and ... Does solar electromagnetic variations influence magnetic excursions and reversals, if so, how and to what extent?...
Very helpful
potato?
I have to make a summary about this aghhhh earth science assingment
Do you need help understanding anything? :)
GIULIANA WHAT ARE YOU DOING HERE LMAO I'M LATE FOR EARTH SCIENCE
@@ThomasStevensontutor you explain very well
This is exactly the video i needed thank you
How can you determine the age of the seafloor in relation to its depth?
If you mean depth below sea level, there is no link there.
If you mean the thickness of oceanic lithosphere, then that increases with age as more mantle rock is accreted onto the bottom of the crust. This means it's possible to estimate the age of the seafloor (to the nearest few million years) by measuring the total thickness of lithosphere beneath it!
i feel like this background music is very reminiscent of red dead redemption 2
who else is here for school
Used this for my Grade 10 class. Thank you so much!
I'm glad you found it helpful! :)
So, where are the subduction zones? In my opinion, you will not find any. Because earth is growing.
Interesting theory. Would you like to elaborate on that?
@@ThomasStevensontutor I try. English is not my mother´s language :) My thoughts go like that: after the formation of earth, which made it frome a tiny accumulation of rocks ever so slightly bigger and bigger it became a water world, maybe icy on the surface, with a core getting hotter and bigger, and containing more and more iron. When iron meets water- it expands and accumulates weight. So it behaved sort of like a sponge. When you try to "shrink" the earth, you will see, that the continents make a nearly perfect enclosure on the smaller mantle. I do not know if this is right or wrong, but seems so much more plausible. I don't know, if planets "normally" are known to stay as they are, or vary in their size after primary formation.
can anyone how paleomagnetism work?
How can I determine the width of the stripess plss help :
If you look up 'Mid-Atlantic Ridge magnetic stripes', you can find some maps that show them in black and white. Then you should be able to measure the stripes from the map.
Are you trying to estimate seafloor spreading rates, or something like that?
3:00
whoooooo
thank you for your video!
great video!
the plasma catastrophe
i hate the music so much i dont know why
Zero taste
Maybe stop breathing in the mic bro
Poles flip every 250k. At least that’s new data is. Lol we are over due and a pole flip..... according to what I see now, may occur by 2023.
give your prediction on next magnetic field . (THAT'S ON MY MODULE I DON'T KNOW THE ANSWER SHSKAHHSUDHSFHAHSUHSDHSHS)
Are you asking me? I'm afraid I don't completely understand the question :/
@@ThomasStevensontutor I repeat the video a lot because this is the video my teacher send to us , thankyou for this I'm actually just stupid but I answered the question 🥰
This is a fantastic video. Saved me a lot of relentless google searches trying to grasp the concept. Thanks :)
Glad to hear it! Is there anything you're still confused about, or anything else you'd like me to cover in future videos?
Thank you 🙏