Came across a (https://www.youtube.com/watch?v=g6thUIR3_rI) which describes Earth’s magnetic field having switched hundreds if not thousands of times during Earth’s 4.5 billion years.
So, how do we know thats a fact? What are scientists looking at that helped them determine this?
In: 2148
We don’t know it.
Some people make a projection based in the changes we can observe.
What phenomenon creates the Magnetic Fields? Why does the lava takes 300,000 years to change it if is in constant movement.
Side note – currently reading this book
[Sunfall by Jim Al-Khalili](https://www.goodreads.com/book/show/32603487-sunfall)
Written by a highly respected scientist in the Uk – set in near future where Earths magnetic field fails. Based on solid science. Entertaining in its own right but totally based on this subject
As the layers of rocks form the magnetic material aligned with the earth magnetic poles and roughly that time frame there is a slow progression of the magnetic material changing alignment to the movement of the earth’s magnetic poles.
Time frame was arrived at by how deep the layers are and looking at levels of elements left in the rock. Such as carbon 14 but I’m sure they looked at others as well.
I don’t know for sure, but I believe it’s due to the way rocks form. You can see a difference in the structure if the magnetic field is reversed. I assume it’s the direction of the grain found in ferrous material.
Latest Answers