Electric Universe Ping!
“Earth is not the same everywhere. In recent years, researchers have been sounding Earth’s crust to determine the 3D electrical properties of our planet. These magnetotelluric surveys reveal huge variations in conductivity from place to place, depending on the mix of underlying rock.”
“which determined that sedimentary rock is more conductive than igneous rock”
OK, This has me intrigued... Wonder why? We know igneous has more metals, so what would make sedimentary more conductive? Silica? This needs further investigation. Could explain why Vortexes are found in places with sedimentary. But why?
Always wondered if those geomagnetic signatures could be determined or left their mark on magnetic tape. Might help in determing where the tape was last.