Just as regional variations can reflect changes in the composition of water, so can depth. The deeper the groundwater is, the more similar the composition is to brine. The biggest change is in the composition of underground mineral water, which is often spewed out of the ground and turned into mineral springs, many of which have healing properties. There are mineral springs with high calcium content, mineral springs with high bromine and iodine content, and mineral springs with sulfur, radium, lithium, iron and other mineral springs. The formation of these mineral springs is related to the dissolution of ore beds in groundwater and the infiltration of rocks of different compositions by groundwater. Explaining the formation of mineral springs from their chemical composition is an interesting and important task for science. Now, let's look at the elemental composition of sea water.