5.30x10^22 x 261.35g/6.02x10^23 = 23.01 g Ba(NO3)2
It changes because when the 2 tectonic plates collide they form mountains and volcanoes.
Continental drift causes tectonic plates to either "pull apart" or "crash" into each other.
Plates that crash into each other either form mountains, or when one slides under the other (a subduction zone) volcanoes from.
Voltage difference is the push that causes charges to flow from high to low areas.
