It is feasible to obtain a comprehensive ordering of eruptive rocks based on two fundamental criteria: acidity and alkalinity. These concepts are eminently chemical, but it must be kept in mind that the chemistry of the main elements can be deduced starting from the mineralogical proportions ...
This process is enhanced if the soil and rocks have been broken up for various reasons like urban development and mining. Limestone contains high levels of calcium carbonate. When used to decrease the acidity at homes, it can run off into surface waters and raise the alkalinity level. ...