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 are formed when magma from within the Earth's buoyant upper mantle rises and leaks onto the Earth's crust as volcanic eruptions which happen at destructive or constructive plate boundaries. It is avent on the planet's surface which allow magma, volcanic ash and volcanic gases to escape.