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.
Volcanoes occur at divergent plate boundaries because of the new crust formed by solidifying of magma on the ocean bed which is very weak so the heat and pressure from the magma chamber will become too high to handle and there will be an eruption. Volcanoes form where the earth's crust is thin an the magma can flow to the surface easier.