Olivine inside Earth releases a large amount of electrons
The mantle occupies most of the volume of Earth, its main constituent is olivine. On the ground surface, you can find the olivine and peridotite that came out as the magma rises.
image from wikipedia
The chemical composition of olivine is written as Mg2SiO4, but it reacts with methane CH4 inside the mantle to generate water and carbon dioxide.(Mg may changed to Fe)
2Mg2SiO4 + CH4 -> 2Mg2SiO2 + 2H2O + CO2 + 4e-
O2 is separated from SiO4 by phase transition. The volume will expand. At this time, two electrons used for bonding are released. The emitted electrons become ions or are taken into the interstices of rocks. Rocks are dielectrics and have the characteristic of capturing electrons within the crystal structure.
Actually, since gravity is not working inside Earth, SiO2 and water, carbon dioxide, and electrons which have undergone phase transition move toward the surface by centrifugal force. Movement of the substance while increasing the volume results in enlarging Earth's surface. The most accumulated electrons are around 275 km underground. When this electron rotates on its own axis, ELF of Schumann resonance is generated. Also, the rotation due to the rotation of electrons also creates Earth's magnetic field.
The electrons captured inside the dielectric gradually move toward the surface of Earth, but the speed of movement decreases with the occurrence of gravity. It can be inferred that the depth at which electron transfer decreases is around 10 km underground. Earthquake hypocenter is concentrated in the vicinity of 10 km underground. Probably the place where gravity occurs is also considered to be around 10 km. If the occurrence of gravity is much lower, the depth of the trench should be even deeper. The sea water pressure gets higher as it gets deeper.
The generation of a large amount of electrons from the interior of Earth means that Earth is a huge battery. The negative charges from Earth's interior and the solar-like positive charges face each other with the atmosphere. Our environment is in the potential difference of 300,000 volts of Earth's surface and the ionosphere.