What is the difference between vulcanicity and volcanicity?
Vulcanicity is a process through which gaseous, liquid and solid materials are forced out of the earths crust to the earths surface.
Volcanicity is the process where igneous materials reaches the earths surface from the earths crust to the earth surface
A term derived from a particular bottled water company as a pseudo-scientific attempt to sell their product. All natural waters contain "minerals". Volcanicity could possibly be defined as a particular mineral composition of the water that indicates that it's hydrological facies is of igneous origin.