Where do we use recrystallization in real life?

Recrystallization is a separating technique in chemistry in which mixtures are dissolve in appropriate solvent, this leads to the separating out of one of the components of the mixture leaving behind the other component. The technique is used to purify solid substances. 
In real life, the technique finds application in re-crystallization of metals.

That result from subduction of oceanic plates beneath lighter continental plates. most of the earth's volcanoes are located around the pacific ring of fire because that the location of most of the earth's subduction zones.