Made of molten nickel and iron and the currents in it creates the earths the earth's magnetic field​

Answer is in the photo. I couldn't attach it here, but uploaded it to a file hosting. link below! Good Luck!

cutt.ly/wzUiVyK

they were destroyed coming out of the civil war but after he war they were booming. if you need an in-depth answer follow up with me  

down below

radiative zone

explanation    

radiative zone is the layer of the sun which energy is transferred away from the core by radiation. although, the core is the only part of the sun that produces an appreciable amount of heat through fusion. in fact, 99% of the energy produced by the sun takes place within 24% of the sun's radius.