The rift<span> is a narrow </span>zone<span> that is a developing divergent tectonic plate boundary, in which the </span>African<span> Plate is in the process of splitting into two tectonic plates, called the Somali Plate and the Nubian Plate, at a rate of 6–7 mm annually.</span>
The electrical property of the membrane changes. There is a small undershoot in the membrane potential.
Yes it occurs naturally on everyone :)