What is the function of the peripheral system and its function? peripheral nervous system is all the nerves located outside the  central nervous system; connects the central nervous system to all  the parts of the body. 1 person found this useful.
Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger.
Most volcanoes occur along plate margins or at 'hotspots' in the earth's crust.Volcanoes are openings in the earth's crust that spew out molten lava,ash,steam and gas. Deep beneath every volcano lies a reservoir of molten rock called a magma chamber. just now. Report Abuse. Volcanoes occur where magma rises through the Earth's crust and reaches the surface. To do this, the magma must find a weakness in the crustal rocks on either the land or under the sea. Most of the volcanoes occur at, or close to, the edges of tectonic plates.