ABSTRACT
Volcanics represent a wide variety of rocks and formations that have taken their common origin from different types of magma poured on the Earth’s surface. In addition to these effusive rocks, typically lavas and tephra, they include also intrusive formations, linked to volcanism, such as dykes and sills, and also cooled magma chambers, weathering of sediments and rocks derived from volcanic materials, and complex sedimentary bodies directly associated to volcanic activity. Such a variety results in extremely diverse hydrogeological conditions of these rocks.
