Vulcanicity: This is the process by which molten materials from the mantle (magma) are intruded into the Earth’s crust but also extruded from the crust. Volcanicity: This refers to the ways by which magma is intruded into the earth’s crust. Through fracture, fissures found in the crust magma found inside the crust can sometimes reach … Continue reading VULCANICITY AND VOLCANICITY